Argothian Elder, Griffin Canyon, and Oko, Lorwyn Liege // Oko, Shadowmoor Scion

Prerequisites

• Argothian Elder on the battlefield
• Griffin Canyon on the battlefield
• Oko, Lorwyn Liege // Oko, Shadowmoor Scion on the battlefield

Steps

1. Activate Oko's first loyalty ability by putting two loyalty counters on it, causing Argothian Elder to gain all creature types
2. Activate Argothian Elder by tapping it, untapping Griffin Canyon and another land
3. Activate Griffin Canyon's second ability by tapping it, untapping Argothian Elder and giving it +1/+1 until end of turn
4. Repeat from step 2

Results

• Infinite mana lands you control can produce
• Infinitely large creature until end of turn
• Infinite untap of lands you control