Want to play a game within a game, let's play Simon says, but let Sindar be the caller. Unfortunately, she only has one command.
Sindar, the Corruptor
with regen from Vine Grafter
makes the AI make bad decisions. Sindar wins 2 games a run with OTK. Even if you lose Sindar, Waxing Moon
can help you clear the board enough for you to carry the game.
I play this some in Throne also with decent success.