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From $12.50
'Activated abilities of artifacts your opponents control can't be activated. [+1]: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each...
From $3.00
'{T}: Add {C}.
{4}, {T}: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...
'[+4]: Target player exiles a card from their hand. [−3]: Exile target permanent. [−14]: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those...