Mill is Key

Whenever another permanent enters the battlefield under your control, each opponent mills a card.

Flying

Whenever an opponent draws a card, you may draw two cards.

Search your library for a card, put that card into your hand, then shuffle.

Counter target creature spell.

Creature spells you cast cost {2} less to cast.

Creatures you control get -1/-1.

({T}: Add {U}.)

[+1]: Draw a card. Target player mills a card.

[0]: Target player mills ten cards.

[−7]: Any number of target players each draw twenty cards.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

Counter target noncreature spell.

Draw a card. Scry 2.

Whenever you draw a card, target opponent mills two cards. If two nonland cards that share a color were milled this way, repeat this process.

{5}{U}: Draw a card, then discard a card.

({T}: Add {B}.)

Target player mills two cards.

Draw a card.

Destroy target non-Merfolk creature.

Wight of Precinct Six gets +1/+1 for each creature card in your opponents' graveyards.