Primal Spawning Pool

{t}: Add {c} to your mana pool.
{5}, {t}: Zerg spells you cast have cascade until
end of turn. Activate this ability only during
your second main phase.
{10}, {t}, Sacrifice this land: put four +1/+1
counters on target Zerg creature you control,
then proliferate.
The first spawning pool. It existed before names. From
this primordial place, the Zerg arose.
—Zurvan, Primal Zerg