Auriok Bladewarden + Umbral Mantle Combos

Combo 1 with Mayael's Aria

Steps

1. At the beginning of your upkeep, Mayael's Aria triggers.
2. Holding priority, activate Auriok Bladewarden by tapping it, giving itself +X/+X until end of turn, where X is its power.
3. Activate Auriok Bladewarden by paying {3} and untapping it, giving it +2/+2 until end of turn.
4. Repeat from step 2 until Auriok Bladewarden has power nineteen or greater, omitting step 3 on the final iteration, if possible.
5. Resolve the Mayael's Aria trigger from step 1, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game.