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From $0.75
'This land enters tapped unless you control a Forest or an Island.
{T}: Add {G} or {U}.
From $2.50
'At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X...
From $2.50
'Search your library for up to X basic land cards, where X is the number of lands you control, put them onto the battlefield tapped, then shuffle.
From $0.25
'You may choose not to untap this creature during your untap step. {T}: Tap target artifact. It doesn't untap during its controller's untap step for as long as this creature...
From $4.00
'Trample Cultivator Colossus's power and toughness are each equal to the number of lands you control. When this creature enters, you may put a land card from your hand onto...
From $0.25
'Draw cards equal to the mana value of target artifact or creature you control. An opponent gains control of that permanent.
From $19.25
'All Rats have fear.
{T}, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.
From $1.25
'Whenever an opponent taps an artifact for mana, gain control of that artifact until the end of your next turn.
From $9.00
'If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
From $0.75
'As this creature enters, choose a creature type.
This creature is the chosen type in addition to its other types.
Other creatures you control of the chosen type get +1/+1.