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$0.25
{T}, Sacrifice another artifact: Exile the top X cards of your library, where X is one plus the mana value of the sacrificed artifact. You may play those cards this...
$0.25
'{1}, Reveal X black cards from your hand, Sacrifice this creature: Exile up to X target cards from a single graveyard.
From $0.50
'Whenever Armix attacks, you may discard a card. When you do, target creature defending player controls gets -X/-X until end of turn, where X is the number of artifacts you...
$0.25
'Enchant creature When this Aura enters, mill two cards. (Put the top two cards of your library into your graveyard.) Enchanted creature gets -X/-0, where X is the number of...
From $1.50
'For each of X target permanents, create X tokens that are copies of that permanent.
From $8.50
'You draw X cards and you lose X life, where X is the mana value of a commander you own on the battlefield or in the command zone.
From $2.75
As an additional cost to cast this spell, blight X. X can't be greater than the greatest toughness among creatures you control. (Put X -1/-1 counters on a creature you...
From $0.75
'At the beginning of your first main phase, each opponent loses X life and you gain X life, where X is the number of Shrines you control.
$14.09
Dragon Shield Classic Art, Standard Sized Sleeves, 100ct Box Part of the Dragon Shield Constellations Art sleeve series, the high-quality print of the Signoir artwork is printed on Brushed Art...
From $3.25
'This spell costs {X} less to cast, where X is the total mana value of Dragons you control. Flying, trample {2}{G}, Sacrifice a land: Return this card from your graveyard...
$0.25
'{1}, Reveal X green cards from your hand, Sacrifice this creature: Target creature gets +X/+X until end of turn.