Contamination [Urza's Saga]Set: Urza's Saga Type: Enchantment Rarity: Rare Cost: {2}{B} At the beginning of your upkeep, sacrifice Contamination unless you sacrifice a creature. If a land is tapped for mana, it produces {B} instead of any other type and amount.

you may return target tapped creature an opponent controls to its owner's hand

then remove all fate counters from all permanents

Set: Magic 2011 Promos Type: Creature — Specter Rarity: Common Cost: {1}{B}{B} Flying

exile one of them face down

Sacrifice a creature: Target creature gets -2/-2 until end of turn

target player may put Ley Weaver into their hand from their library

Set: Sun & Moon: Team Up Type: Dragon Rarity: Promo Retreat cost: Colorless

It soon became obvious that some experiments were best overseen by fireproof teachers

instead exile it and put a number of +1/+1 counters equal to that creature's power on Ravenous Slime

"The purest ore is produced from the hottest furnace

Set: Sun & Moon: Unified Minds Type: Energy Rarity: Secret Rare

Set: Beta Edition Type: Artifact Rarity: Rare Cost: {0} {T}: Add {U}