Killing an opponent's Seer allows you to draw a card, sure, but by then your opponent has already taken the best card out of your hand, so youll have to evoke that Thoughtseize bug to draw something good enough to replace it
Other Sized Cards There have been a few other types of cards that Magic has printed, but they were generally distributed as prizes or as a bonus for purchasing Magic products
At minimum you'll be paying 3 mana to save your commander, draw and discard a card which feels like a fair deal for its mana cost and I can see many Dimir graveyard, discard, reanimator or Izzet/Grixis wheel deck slot this card for its instant speed potential
In the rare case that the Elf card you return to your hand doesn't have power, you'll gain 0 life
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