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From $0.75
'Discard a card: You may cast a creature spell from your graveyard this turn. Activate only once each turn. Whenever a nontoken creature you control enters, if you didn't cast...
From $2.00
'Lands you control have "{T}: Add one mana of any color."
{T}: Add one mana of any color.
From $14.00
'[+1]: Look at the top four cards of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest...
From $27.75
'All permanents are artifacts in addition to their other types. All cards that aren't on the battlefield, spells, and permanents are colorless. Players may spend mana as though it were...
From $29.25
'{T}: Add one mana of any color in your commander's color identity.
From $74.00
{T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a legendary spell. {T}: Add one mana of any color among legendary permanents you...
From $38.25
'{T}, Sacrifice this artifact: Add three mana of any one color. Spend this mana only to cast your commander.
From $42.25
'As Three Tree City enters, choose a creature type. {T}: Add {C}. {2}, {T}: Choose a color. Add an amount of mana of that color equal to the number of...
From $22.25
'This land enters tapped unless you have two or more opponents.
{T}: Add {W} or {B}.
From $6.75
Activated abilities of creatures you control cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana.
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.