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$0.25
'Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
From $0.50
'Counter target spell. If you control a Wizard, add an amount of {C} equal to the amount of mana spent to cast that spell at the beginning of your next...
From $3.25
'You don't lose unspent green mana as steps and phases end.
Omnath gets +1/+1 for each unspent green mana you have.
From $40.75
'Exile a creature you control: Add X mana of any one color, where X is 1 plus the exiled creature's mana value. Spend this mana only to cast creature spells.
From $2.25
'Hexproof
This land enters tapped.
When this land enters, sacrifice two lands.
{T}: Add three mana of any one color.
From $2.75
'Counter target spell unless its controller pays {1}.
From $6.75
'You don't lose unspent green mana as steps and phases end.
Omnath gets +1/+1 for each unspent green mana you have.
From $18.00
'This land enters tapped unless you have two or more opponents.
{T}: Add {U} or {R}.
From $3.50
'Counter target spell unless its controller pays {1}.