Crab Umbra + Krenko, Mob Boss + Phyrexian Altar

UR identity

Commander legal

The 3 combo pieces

What must be in place

You control at least three Goblins.

How to execute it

  1. Activate Krenko by tapping it, creating at least three 1/1 Goblin creature tokens.
  2. Activate Phyrexian Altar three times by sacrificing three Goblin tokens, adding {2}{U}.
  3. Activate Crab Umbra by paying {2}{U}, untapping Krenko.
  4. Repeat.

What the combo produces