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Prioritize Zombie synergies like lords, repeatable token makers, and death triggers

At the beginning of each end step, if you gained 3 or more life this turn, create a 3/3 white Bird creature token with flying and "Whenever this token attacks, target attacking creature gains flying until end of turn." Whenever Gwaihir attacks, target attacking creature gains flying until end of turn

Hidetsugus Poison Rite Decks using poison counters are typically focused on quickly eliminating opponents, making Hidetsugu's Poison Rite a perfect addition

lets look at why

Casting stuff that costs five or more is the lifes blood of Commander