Activate Abuelo by paying {1}{W}{U}, exiling Wormfang Manta.
When Wormfang Manta leaves the battlefield, its second ability triggers, causing you to take an extra turn after this one.
At the beginning of your end step, Abuelo triggers, returning Wormfang Manta to the battlefield from exile.
Wormfang Manta's first ability does not trigger when it enters the battlefield due to Hushwing Gryff.
Repeat each turn.

Infinite turns

Abuelo, Ancestral Echo

Wormfang Manta

Hushwing Gryff

Activate Abuelo by paying {1}{W}{U}, exiling Wormfang Manta.
When Wormfang Manta leaves the battlefield, its second ability triggers, causing you to take an extra turn after this one.
At the beginning of your end step, Abuelo triggers, returning Wormfang Manta to the battlefield from exile.
Wormfang Manta's first ability does not trigger when it enters the battlefield due to Tocatli Honor Guard.
Repeat each turn.

Tocatli Honor Guard

Activate Abuelo by paying {1}{W}{U}, exiling Wormfang Manta.
When Wormfang Manta leaves the battlefield, its second ability triggers, causing you to take an extra turn after this one.
At the beginning of your end step, Abuelo triggers, returning Wormfang Manta to the battlefield from exile.
Wormfang Manta's first ability does not trigger when it enters the battlefield due to Torpor Orb.
Repeat each turn.

Torpor Orb

Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
At the beginning of your end step, Abuelo triggers, returning Ugin's Nexus from exile to the battlefield.
When Ugin's Nexus enters the battlefield, Replication Specialist triggers, causing you to pay {1}{U} to create a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
Move to your next turn, not skipping it as Ugin's Nexus is not on the battlefield.
Repeat from step 2.

Ugin's Nexus

Replication Specialist

Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
At the beginning of your end step, Abuelo triggers, returning Ugin's Nexus from exile to the battlefield.
When Ugin's Nexus enters the battlefield, Mirrorworks triggers, causing you to pay {2} to create a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
Move to your next turn, not skipping it as Ugin's Nexus is not on the battlefield.
Repeat from step 2.

Combos with "Abuelo, Ancestral Echo"