Crystalline Nautilus [Journey into Nyx]

Crystalline Nautilus [Journey into Nyx]Set: Journey into Nyx Type: Enchantment Creature Nautilus Rarity: Uncommon Cost: {2}{U} Bestow {3}{U}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.) When Crystalline Nautilus becomes the target of a spell or ability, sacrifice it. Enchanted creature gets +4 +4 and has "When this creature becomes the target of a spell or ability, sacrifice it."

When Plague Boiler has three or more plague counters on it

Set: Conspiracy Tokens Type: Token Creature — Squirrel Rarity: Common

I like to break windows and take what's inside

Sometimes the trophies prove more than ornamental

Set: Chronicles Type: Artifact Rarity: Common Cost: {0} {T}

you feast on living flesh

That player loses 7 life

Set: Guilds of Ravnica Type: Creature — Frog Rarity: Common Cost: {2}{U} Leapfrog has flying as long as you've cast an instant or sorcery spell this turn

Sacrifice Bounty Agent: Destroy target legendary permanent that's an artifact

but as ice it holds the stillness of truth

Set: Planar Chaos Type: Legendary Land Rarity: Rare Each land is a Swamp in addition to its other land types

Street folk call them "spire mice