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From $20.00
As long as The Aetherspark is attached to a creature, The Aetherspark can't be attacked and has "Whenever equipped creature deals combat damage during your turn, put that many loyalty...
From $18.75
'Equipped creature gets +5/+5. Whenever equipped creature deals damage to a creature, exile that creature. (Exile it only if it's still on the battlefield.) Equip {4} ({4}: Attach to target...
From $1.00
'{T}: Add {C}. {T}, Pay 1 life: Add one mana of any color. Spend this mana only to cast a Vampire spell. {5}, {T}: Create a Blood token. This ability...
From $44.00
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.
From $2.50
'Whenever you cast your first instant or sorcery spell each turn, exile an instant or sorcery card at random from your graveyard. Then copy each card exiled with this enchantment....
From $5.50
'Flash
Other Merfolk you control get +1/+1.
Sacrifice a Merfolk: Counter target noncreature spell unless its controller pays {1}.
From $35.75
'{T}, Sacrifice this artifact: Add three mana of any one color. Spend this mana only to cast your commander.
From $2.25
'Destroy target artifact you don't control.
Overload {4}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
From $31.75
'As Throne of Eldraine enters, choose a color. {T}: Add four mana of the chosen color. Spend this mana only to cast monocolored spells of that color. {3}, {T}: Draw...