Examples: Arcane Sanctum (enters tapped, taps for white/blue/black) Nomad Outpost (enters tapped, taps for red/white/black) 3
(10/4/2004) This card only looks at permanents, not spells on the stack
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9.8/10$0.23 Corrupted Conviction Instant As an additional cost to cast this spell, sacrifice a creature
You can use its ability to deal reasonable amounts of damage to kill other small creatures on the board
Maybe my favorite Saga of the set, Awaken the Honored Dead does exactly what you want it to do for three mana: destroy a nonland permanent