
Creature — Nightmare Horse
Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.
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→ Infinite colored mana, Infinite death triggers, Infinite energy counters
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
→ Infinite LTB, Infinite ETB, Infinite colored mana
→ Infinite ETB, Infinite LTB, Infinite death triggers
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
→ Infinite black mana, Infinite death triggers, Infinite ETB
The ability that defines Nightmare’s power and toughness works everywhere, not just on the battlefield.
Nightmare’s ability counts all lands you control with the subtype Swamp, not just ones named Swamp.
Nightmare’s power and toughness changes as the number of Swamps you control changes.
If you control 0 swamps, then the Nightmare has 0 toughness and will be put into its owner’s graveyard as a state-based action right before the next player gains priority.