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From $48.50
'Whenever a creature enters, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it.
From $29.50
'At the beginning of your upkeep, flip a coin. If you lose the flip, this artifact deals 3 damage to you.
{T}: Add {C}{C}.
From $76.00
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
From $82.00
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
From $1.25
'Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
From $24.75
'At the beginning of your upkeep, you draw a card and you lose 1 life.
From $7.00
'If an opponent cast three or more spells this turn, you may pay {0} rather than pay this spell's mana cost.
Exile any number of target spells.
From $137.25
'This artifact doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap this artifact. At the beginning of your draw...
$0.25
'Target creature gets +2/+0 and gains first strike until end of turn.
Create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")
From $36.75
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.