When they all die and there's no one left for that creature to attack but you, simply pay two mana to exile it
It's been mentioned in conjunction with Grist, the Hunger Tide, which, when exiled with the Cauldron, turns all of your creatures with +1/+1 counters into pseudo-Planeswalkers with Grist's loyalty abilities
Ive had the most fun playing around Human Torch, but it handles very differently depending on who helms it
To really get our moneys worth, I think were likely to need a combo that exploits the ability to untap all of our creatures over and over again, like Jeskai Ascendancy or Intruder Alarm would
Goblin Tutor : Not legal in most formats, you'll probably need to rule 0 with your group to play it, but this tutor from the UN sets is both random and a fun tutor
They're free