Menace Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile a nonland card
Land Tax, known as the white Ancestral, allows a player who's behind on the land count to search his or her library for three basic lands a turn, and then draw the normal card for the turn on top of the previous trio
Minds Dilation Mind's Dilation is another generally powerful card that has just enough chaos to it to make this list
Ramp solves speed issues but causes savage card disadvantage etc
This actually does get around the commander tax because rather than casting Yuriko, commander ninjutsu merely puts it onto the battlefield
The potential of this equipment in a flying/token matters deck is absurd, and even the little evasive commanders can become game winning threats on their own