Namor the Sub-Mariner, Phyrexian Altar, Mystic Speculation, and Will Kenrith

Prerequisites

• Namor the Sub-Mariner on the battlefield
• Phyrexian Altar on the battlefield
• Mystic Speculation in hand
• Will Kenrith on the battlefield
• available

Steps

1. Activate Will Kenrith's second loyalty ability by removing two loyalty counters from it, causing you to draw two cards and causing instant, sorcery and planeswalker spells you cast to cost less to cast until your next turn
2. Cast Mystic Speculation by paying due to Will Kenrith
3. Namor triggers, creating a 1/1 Merfolk creature token
4. Resolve Mystic Speculation
5. Activate Phyrexian Altar by sacrificing the Merfolk, adding
6. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite magecraft triggers
• Infinite sacrifice triggers
• Infinite scry
• Infinite storm count