Pickings are slim and we win no Harpies, though we do grab Brain Control for (distant) future use, Fire Eye (800/600/2*/PYRO) thats handy versus Weevil, and a surprise Cannon Soldier (1400/1300/4*/FIEND) and badly-needed Genin (600/900/3*/DREAMS) from Solomon
The best 1-drops in Magic is a vastly different list, but I like the balance of color and power that becomes possible when you invest just a bit more
PDF guide is clear
Waboku X TRAP You take no battle damage this turn
Once per turn, while you control one other monster: Target 1 monster your opponent controls and 1 monster you control (except this card) and banish them if able, and if you do, this card gains 800 ATK for each monster that was banished until the End Phase of your next turn
Most of the game winning combinations revolving around him come from milling your opponent until they have no cards left to draw, or shutting down their ability to play altogether