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From $19.75
'Whenever an opponent taps a land for mana, tap all lands that player controls.
If a creature an opponent controls attacks, all creatures that opponent controls attack if able.
From $104.75
'If you control a commander, you may cast this spell without paying its mana cost.
You may choose new targets for target spell or ability.
From $18.25
{T}: Add {R}.
{T}: Add {U}. Activate only if you control an Island or a Mountain.
From $2.00
When this creature leaves the battlefield, draw a card, then you may put a permanent card with mana value less than or equal to the number of lands you control...
From $19.50
Each creature you control enters with an additional +1/+1 counter on it for each mana from an artifact source spent to cast it. {T}: Create a Treasure token. (It's an...
From $10.75
'Colorless creatures you control get +2/+2.
Whenever you tap a permanent for {C}, add an additional {C}.
Whenever you cast a colorless spell, you gain 2 life.
From $2.50
'Red creatures you control get +1/+0. White creatures you control get +0/+1. {R}{W}, Exile this enchantment: Exile all creatures you control. At the beginning of the next combat, return those...
From $0.75
'Kalonian Twingrove's power and toughness are each equal to the number of Forests you control. When this creature enters, create a green Treefolk Warrior creature token with "This token's power...
From $3.00
'Deathtouch
Whenever another creature you control enters, you gain 1 life.
Whenever another creature you control dies, each opponent loses 1 life.
From $10.00
'Whenever a creature is dealt damage, this enchantment deals that much damage to that creature's controller.
From $26.50
'Exile target creature. Its controller gains life equal to its power.