Biotransference + Rapacious One + Time Sieve

UBR identity

Commander legal

The 3 combo pieces

• Biotransference
• Rapacious One
• Time Sieve

What must be in place

Rapacious One does not have summoning sickness.
Rapacious One can not be blocked.

How to execute it

1. Declare Rapacious One as an attacker.
2. When Rapacious One deals combat damage, it triggers, creating at least five 0/1 Eldrazi Spawn tokens.
3. Activate Time Sieve by sacrificing five Eldrazi Spawn creature tokens, taking an extra turn after this one.
4. Repeat.

What the combo produces

• Infinite turns
• Lock