Memory Erosion

Whenever an opponent casts a spell, you may draw a card unless that player pays .

Whenever you cast a blue spell, target player mills two cards.

Whenever you draw a card, each opponent mills two cards.

Whenever an opponent casts a green spell, you draw a card.

Whenever this creature deals damage to an opponent, that player mills a card.

Whenever you cast a historic spell, target player mills two cards. (Artifacts, legendaries, and Sagas are historic.)