Crystalline Crawler + Doubling Season + Phyrexian Altar + Sigil of the New Dawn

Mana needed: {4} in at least three different colors

GW identity

Commander legal

The 4 combo pieces

How to execute it

  1. Cast Crystalline Crawler giving it six +1/+1 counters because of Doubling Season.
  2. Remove all six counters getting {W} {W} {U} {B} {R} {G}.
  3. Sacrifice Crawler to Altar for one mana of any color.
  4. Pay Sigil's cost of {1}{W} returning Crawler to hand.
  5. Recast Crystalline Crawler for all but one of the remaining floating mana giving it eight +1/+1 counters.
  6. Remove all eight counters netting {8} of assorted colors containing at least {W} {W} {U} {B} {R} {G}.
  7. Repeat steps 4-7.

What the combo produces