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From $13.50
'This artifact enters with X charge counters on it. Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that...
From $16.50
Pokémon - Stage 1 HP: 50 Pokémon Power - Sneak Attack: When you play Dark Golbat from your hand, you may choose 1 of your opponent's Pokémon. If you do,...
From $39.75
'Repeat the following process X times. Each opponent loses 3 life unless that player sacrifices a nonland permanent of their choice or discards a card.
From $0.75
'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 $9.50
'Vigilance, trample
This creature enters with X +1/+1 counters on it.
When this creature enters, destroy any number of target artifacts and/or enchantments with total mana value X or less.
From $33.75
At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power.
From $2.50
'Subterranean Tremors deals X damage to each creature without flying. If X is 4 or more, destroy all artifacts. If X is 8 or more, create an 8/8 red Lizard...
From $0.50
'Return each creature card with mana value X or less from your graveyard to the battlefield. Exile those creatures at the beginning of your next upkeep. Exile Rally the Ancestors.
From $0.25
'Destroy all creatures, then create an X/X colorless Phyrexian Horror artifact creature token, where X is the number of creatures destroyed this way.
From $0.25
'Manifest dread X times, then put X +1/+1 counters on each of those creatures. (To manifest dread, look at the top two cards of your library, then put one onto...
$0.25
Whenever one or more -1/-1 counters are put on a creature, put a charge counter on this artifact. {T}: Add one mana of any color. {5}, {T}, Sacrifice this artifact:...
$0.25
'Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) When Imskir enters, you draw X cards and you lose X life, where X is...