Horseshoe Crab + Incubation Druid + Quicksilver Elemental

Mana needed: {U}{U}

GU identity

Commander legal

The 3 combo pieces

• Horseshoe Crab
• Incubation Druid
• Quicksilver Elemental

What must be in place

Quicksilver Elemental has at least one +1/+1 counter on it.
Quicksilver Elemental does not have summoning sickness.

How to execute it

1. Activate Quicksilver Elemental twice by paying {U}{U}, causing it to gain all activated abilities of Incubation Druid and Horseshoe Crab until end of turn.
2. Activate Quicksilver Elemental using Incubation Druid's first ability by tapping it, adding {U}{U}{U}.
3. Activate Quicksilver Elemental using Horseshoe Crab's ability by paying {U}, untapping it.
4. Repeat from step 2.

What the combo produces

• Infinite colored mana