Dance — At the beginning of your end step, each player may discard a card. Each player who discarded a card this way draws a card. If a creature card was discarded this way, you create a 1/2 white Moogle creature token with lifelink. Then if a noncreature card was discarded this way, put a +1/+1 counter on each Moogle you control.
Mog turns your end step into a group looting engine that quietly builds a wide board of lifelinking Moogles. You loot away dead cards to dig for action while accumulating tokens (from discarded creatures) and +1/+1 counters (from discarded noncreatures), then overrun the table with a buffed, lifelinking go-wide army or convert discards into madness, reanimation, and graveyard value.
Repeatable card filtering for the whole table that benefits you most by building a board
Generates lifelinking tokens that gain massive life as your army grows
Counters from noncreature discards make tokens hit hard and survive sweepers better than expected
Synergizes with madness, reanimator, and graveyard-matters cards since you choose what to pitch
Symmetrical discard/draw can refuel opponents, including combo and graveyard decks
Board-centric strategy is vulnerable to wraths, and Mog only triggers on your end step
Three-mana commander with no evasion or protection on its own
Needs Mog plus a payoff (anthem/overrun) to actually close, so it can stall without finishers