Esoterica: Deep Vortex

Mana Pulse (Each time you cast a spell, put a charge counter on this card. At the beginning of each end step, remove all charge counters from this card.)
Spells you cast cost {1} less to cast for each charge counter on Esoterica: Deep Vortex. Spells your opponents cast cost {1} more to cast for each charge counter on Esoterica: Deep Vortex.