Orcish Bowmasters, Agatha's Soul Cauldron, Whirlpool Warrior, and Phyrexian Altar

Prerequisites

• Orcish Bowmasters in hand
• Agatha's Soul Cauldron on the battlefield
• Whirlpool Warrior in exile
• Phyrexian Altar on the battlefield
• Opponents have at least two cards in hand
• available

Steps

1. Cast Orcish Bowmasters by paying
2. When Orcish Bowmasters enters the battlefield, it triggers, creating a 0/0 Orc Army token if you do not control an Army, then putting a +1/+1 counter on an Army you control and dealing 1 damage to any target
3. Activate the Orc Army using Whirlpool Warrior's ability by paying and sacrificing it, causing each player to shuffle their hand into their library, and causing each player to draw that many cards
4. Orcish Bowmasters triggers for each card opponents draw this way
5. Resolve the first trigger, creating a 0/0 Orc Army token, then putting a +1/+1 counter on it and dealing 1 damage to any target
6. Activate Phyrexian Altar by sacrificing the Orc Army, adding
7. Resolve the second Orcish Bowmaster trigger, creating a 0/0 Orc Army token, then putting a +1/+1 counter on it and dealing 1 damage to any target
8. Holding priority, repeat from step 3 an arbitrarily large number of times
9. Resolve the first remaining Orcish Bowmasters trigger, if applicable, creating a 0/0 Orc Army token if you do not control one, then putting a +1/+1 counter on an Army you control and dealing 1 damage to any target
10. Repeat from step 9 for each remaining trigger

Results

• Infinite +1/+1 counters on an Army token
• Infinite colored mana
• Infinite damage
• Infinite death triggers
• Infinite draw triggers for all players
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers