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From $1.75
'Exile X target creatures. For each creature exiled this way, its controller creates a 2/2 green Boar creature token.
From $2.00
'Whenever you cast a permanent spell with a mana cost that contains {X}, double the value of X. Whenever you cast an instant or sorcery spell or activate an ability,...
$0.25
Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
From $0.25
Whenever a nonland creature you control dies, earthbend X, where X is that creature's power. (Target land you control becomes a 0/0 creature with haste that's still a land. Put...
From $17.00
'Whenever this creature attacks, creatures you control gain trample and get +X/+X until end of turn, where X is the greatest power among creatures you control.
From $16.75
'Bloodthirst X (This creature enters with X +1/+1 counters on it, where X is the damage dealt to your opponents this turn.) Menace Enrage — Whenever Indoraptor is dealt damage,...
From $0.75
'Create X tapped 2/1 white and black Inkling creature tokens with flying. If X is 6 or more, destroy all noncreature, nonland permanents.
From $19.00
'Indestructible As long as your devotion to red and green is less than seven, Xenagos isn't a creature. At the beginning of combat on your turn, another target creature you...
From $1.75
'Each opponent reveals cards from the top of their library until they reveal X land cards, then puts all cards revealed this way into their graveyard. X can't be 0.
From $8.00
'Crackle with Power deals five times X damage to each of up to X targets.
From $5.50
'{T}: Add {C}{C}{C}{C}. Spend this mana only on costs that contain {X}.