Whenever a historic creature you control deals combat damage to a player, create a 1/1 black Assassin creature token with menace. (Artifacts, legendaries, and Sagas are historic.)
Aya turns a board of historic creatures—legends, artifact creatures, and the like—into an ever-growing army of menacing Assassin tokens. You curve out aggressive legendary and artifact creatures, swing with menace and lifelink to stay healthy, and snowball each connection into more attackers until the table is buried under bodies.
Each unblocked historic creature generates a token, so a wide board compounds fast
Lifelink on the commander keeps you out of burn/aggro range while pressing the offensive
Menace on Aya and her tokens makes blocking math miserable for opponents
Legendary and artifact creatures are abundant in RW, so 'historic' is easy to hit
Token generation only triggers on combat damage to players, so good blockers or fog effects shut it off
Heavy reliance on the commander; repeated removal or sweepers stall the engine
No built-in card advantage—can run out of gas after a board wipe
Lacks evasion beyond menace, so flyers and ground gummed up by tokens can race you