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Whenever an opponent casts a spell, that player sacrifices a permanent unless they pay {1}.

Skyrider Trainee has flying as long as it's enchanted.

({T}: Add {R} or {G}.) As Stomping Ground enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

({T}: Add {U} or {R}.) As Steam Vents enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

{T}: Add {C}. {R}{G}, {T}: Target creature gets +1/+1 and gains trample until end of turn.

{T}: Add {C}. {3}{W}{B}, {T}: Target player loses 1 life and you gain 1 life.

Orzhov Basilica enters the battlefield tapped. When Orzhov Basilica enters the battlefield, return a land you control to its owner's hand. {T}: A...

{T}: Add {C}. {2}{U}{R}, {T}: Exile the top card of your library. Until your next turn, you may cast it if it's an instant or sorcery spell.

Enchant creature Enchanted creature has "{T}: This creature deals damage equal to its power to target attacking or blocking creature."

Izzet Boilerworks enters the battlefield tapped. When Izzet Boilerworks enters the battlefield, return a land you control to its owner's hand. {T...

Gruul Turf enters the battlefield tapped. When Gruul Turf enters the battlefield, return a land you control to its owner's hand. {T}: Add {R}{G}.

({T}: Add {W} or {B}.) As Godless Shrine enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

As long as equipped creature is tapped, tapped creatures you control get +2/+0. As long as equipped creature is untapped, untapped creatures you co...

{1}, {T}: Add {W}{B}.

{2}, {T}: Exile target card from a graveyard. {2}{W}{B}, {T}, Sacrifice Moratorium Stone: Exile target nonland card from a graveyard, all other car...

{3}: Mizzium Transreliquat becomes a copy of target artifact until end of turn. {1}{U}{R}: Mizzium Transreliquat becomes a copy of target artifact,...

{1}, {T}: Add {U}{R}.

Creatures you control have trample. {1}{R}{G}: Gruul War Plow becomes a 4/4 Juggernaut artifact creature until end of turn.

{1}, {T}: Add {R}{G}.

Flying When Shrieking Grotesque enters the battlefield, if {B} was spent to cast it, target player discards a card.

({R/G} can be paid with either {R} or {G}.) Sacrifice Wild Cantor: Add one mana of any color.

({U/R} can be paid with either {U} or {R}.) When Petrahydrox becomes the target of a spell or ability, return Petrahydrox to its owner's hand.

{2}{W}: Target player gains 1 life. {2}{B}: Each player loses 1 life.

({W/B} can be paid with either {W} or {B}.) Flying Whenever Mourning Thrull deals damage, you gain that much life.