Rootha, Mercurial Artist + Twincast

Mana needed: {2}{U}{U}

UR identity

Commander legal

The 2 combo pieces

• Rootha, Mercurial Artist
• Twincast

How to execute it

1. Cast an instant or sorcery spell, or wait for an opponent to cast one.
2. Holding priority, cast Twincast by paying {U}{U}, targeting the spell.
3. Activate Rootha by paying {2} and returning it to your hand, copying Twincast, with the copy targeting the original Twincast.
4. Resolve the copy of Twincast, copying Twincast, targeting the original Twincast.
5. Repeat step 4.

What the combo produces

• Infinite magecraft triggers