First, have Tidewater Minion, Illusionist's Bracers, and mana sources that produce the colours you want out on the battlefield
It comes with an alternate casting cost of just one black if there are 13 or more creatures in play, which is pretty easy to hit in Commander
Similarly, once the third ability triggers, those creatures will get +4/+4 when it resolves, even if one or more of those creatures left the battlefield
In each player's upkeep, no just yours, you'll draw and then lose a life too if they are devoid of a hand and in top deck mode
If you want the biggest buff for your buck and arent afraid of angering the table, then look to the Melee triggers of Adriana and Skyhunter Strike Force
Marauding Sphinx I felt like I have to rank Marauding Sphinx because blue cards commit crimes on the regular