Tyranid Biovore Elder Giant but others follow their own

but others follow their own esoteric caste system

Set: Mystery Booster Type: Artifact Rarity: Rare Cost: {1} Whenever a permanent enters the battlefield tapped and under your control

Set: Antiquities Type: Artifact Rarity: Rare Cost: {4} {1}

Set: Ixalan Promos Type: Creature — Human Pirate Rarity: Rare Cost: {1}{B} Menace

Sacrifice Flood Plain: Search your library for a Plains or Island card

Tyranid Biovore Elder Giant but others follow their ownBiovores are living artillery pieces, swollen with the clutch of explosive Spore Mines that they nurture within their bodies. Upon anchoring itself to the ground with chitinous spurs, a Biovore undergoes violent spasms that expel its volatile offspring in high arcs as living ammunition. From there, the gas bloated Spore Mines detonate in a shower of bone shards and acid rain, or else drift languidly down onto the battlefield, primed to explode