In standard, Mismagius is pretty good, in expanded, the card is gonna be broken. i will show you its attacks and such, and show you why it will be broken as heck.
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Mismagius – Psychic – HP110
Stage 1 – Evolves from Misdreavus
[P] Chaos Wheel: 30 damage. Your opponent can’t play any Pokemon Tool, Special Energy, or Stadium cards from their hand during their next turn.
[P][C][C] Black Magic: 20x damage. This attack does 20 damage times the number of cards in your opponent’s hand.
Weakness: Darkness (x2)
Resistance: Fighting (-20)
Retreat: 1
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You're probably saying, "Oh, Giratina." Yes, Giratina, but there is a deadly combo this card has, and will be the most broken card since FOGP and Archeops. Ladies and Gentleman, Boys and Girls, Moms and Dads, Grandmas and Grandpas, Germs and Bacteria, and everyone in-between, I present you with the most broken combo of cards since FOGP and every grass type ever....
Mismagius+Dimension Valley
Yup. Dimension Valley makes Mismagius a fricking god. If you forgot what Dimension Valley was, or at least what it did, it was a stadium card that made psychic Pokemon's attacks cost 1 colorless less, you probably want to slap me and say, "YOU IDIOT, ITS FIRST ATTACK ISN'T FOR 1 COLORLESS, ITS FOR 1 PSYCHIC!" Yes I know, did i say it was for its first attack (yes i did imply in the beginning by saying Giratina, but... that's not what I meant), I was saying it for the second, and you're again saying "SO WHAT? YOU STILL NEED 1 PSYCHIC AND A COLORLESS!" Yes, I know, that's where counter energy comes in handy.
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Counter Energy – Special Energy
This card provides 1 [C] Energy.
When this card is attached to 1 of your Pokemon (excluding Pokemon-GX and Pokemon-EX) and you have more Prize cards remaining than your opponent, this card provides 2 Energy of every type.
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This single energy provides Mismagius the ability to use her second attack, for 1 counter nrg attachment, as well as her first attack, then you can use Chaos Wheel with the usual Chaos Wheel effects, next turn Black Magic with a choice band for a good amount of damage, with some supporter cards to help out. If you really wanted to make this deck a true beast, you could go risky and play a Vileplume line from AOR, and just rare candy into vileplume on turn 2 or so, wally and evosoda could help that goal. For the one potiential Darkrai Match-up in expanded, you could use weakness policy to nullify extra weakness damage (not that Mismagius has a whole ton of HP, for that to be truly viable to use)
Here's the gist for the brokeness of the card- Mismagius+Vileplume+Garbodor (Eh, that's more optional)+Dimension Valley+Counter Energy (single attachment to Mismagius)= 50 damage per turn with Chaos wheel against EX's or GX's, or potientally even more damage with Black Magic.
I rest my case- AFEX
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Mismagius – Psychic – HP110
Stage 1 – Evolves from Misdreavus
[P] Chaos Wheel: 30 damage. Your opponent can’t play any Pokemon Tool, Special Energy, or Stadium cards from their hand during their next turn.
[P][C][C] Black Magic: 20x damage. This attack does 20 damage times the number of cards in your opponent’s hand.
Weakness: Darkness (x2)
Resistance: Fighting (-20)
Retreat: 1
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You're probably saying, "Oh, Giratina." Yes, Giratina, but there is a deadly combo this card has, and will be the most broken card since FOGP and Archeops. Ladies and Gentleman, Boys and Girls, Moms and Dads, Grandmas and Grandpas, Germs and Bacteria, and everyone in-between, I present you with the most broken combo of cards since FOGP and every grass type ever....
Mismagius+Dimension Valley
Yup. Dimension Valley makes Mismagius a fricking god. If you forgot what Dimension Valley was, or at least what it did, it was a stadium card that made psychic Pokemon's attacks cost 1 colorless less, you probably want to slap me and say, "YOU IDIOT, ITS FIRST ATTACK ISN'T FOR 1 COLORLESS, ITS FOR 1 PSYCHIC!" Yes I know, did i say it was for its first attack (yes i did imply in the beginning by saying Giratina, but... that's not what I meant), I was saying it for the second, and you're again saying "SO WHAT? YOU STILL NEED 1 PSYCHIC AND A COLORLESS!" Yes, I know, that's where counter energy comes in handy.
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Counter Energy – Special Energy
This card provides 1 [C] Energy.
When this card is attached to 1 of your Pokemon (excluding Pokemon-GX and Pokemon-EX) and you have more Prize cards remaining than your opponent, this card provides 2 Energy of every type.
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This single energy provides Mismagius the ability to use her second attack, for 1 counter nrg attachment, as well as her first attack, then you can use Chaos Wheel with the usual Chaos Wheel effects, next turn Black Magic with a choice band for a good amount of damage, with some supporter cards to help out. If you really wanted to make this deck a true beast, you could go risky and play a Vileplume line from AOR, and just rare candy into vileplume on turn 2 or so, wally and evosoda could help that goal. For the one potiential Darkrai Match-up in expanded, you could use weakness policy to nullify extra weakness damage (not that Mismagius has a whole ton of HP, for that to be truly viable to use)
Here's the gist for the brokeness of the card- Mismagius+Vileplume+Garbodor (Eh, that's more optional)+Dimension Valley+Counter Energy (single attachment to Mismagius)= 50 damage per turn with Chaos wheel against EX's or GX's, or potientally even more damage with Black Magic.
I rest my case- AFEX