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From $4.75
'As an additional cost to cast this spell, you may exile any number of blue cards from your hand. This spell costs {2} less to cast for each card exiled...
From $0.25
Converge — Return up to X permanent cards from your graveyard to your hand, where X is the number of colors of mana spent to cast this spell. Exile Uncle's...
From $1.50
'Destroy target artifact. It can't be regenerated. Create X 1/1 green Saproling creature tokens, where X is that artifact's mana value.
$0.25
'When this creature enters, it deals X damage to any target, where X is the number of permanents you control with oil counters on them.
From $4.50
'This creature enters with X +1/+1 counters on it. When this creature dies, you may distribute a number of +1/+1 counters equal to the number of +1/+1 counters on this...
From $2.50
'When you cast this spell, you gain half X life and draw half X cards. Round down each time.
Flying, trample
This creature enters with X +1/+1 counters on it.
From $5.25
Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Harmonize {X}{G}{G}{G}{G} (You may cast this card from your graveyard...
From $10.00
Pokémon - Stage 1 HP: 50 Lightning Flash 20: Lightning | If the Defending Pokémon tries to attack during your opponent's next turn, your opponent flips a coin. If tails,...
From $0.75
'Flying, first strike, ward {1}
Whenever Captain America attacks, each other Hero you control gets +X/+X until end of turn, where X is Captain America's toughness.
$0.25
'{T}: Target land you control becomes an X/X Elemental creature until end of turn, where X is the number of Allies you control. It's still a land.
$0.25
'{1}, Reveal X green cards from your hand, Sacrifice this creature: Target creature gets +X/+X until end of turn.
From $4.25
'This creature gets +1/+1 for each creature card in your graveyard. {X}{B/G}, {T}, Sacrifice another creature: Search your library for a creature card with mana value X or less, put...