Power Surge [Collectors' Edition] Condition:Played The forest grew fangs

The forest grew fangs

{T}: Exchange target opponent's life total with Tree of Perdition's toughness

Set: Rivals of Ixalan Prerelease Promos Type: Creature — Dinosaur Rarity: Mythic Cost: {3}{W}{W} Enrage — Whenever Trapjaw Tyrant is dealt damage

Set: Urza's Saga Type: Artifact Rarity: Rare Cost: {4} At the beginning of each player's upkeep

Memnarch understands

Power Surge [Collectors' Edition] Condition:Played The forest grew fangsSet: Collectors' Edition Type: Enchantment Rarity: Rare Cost: {R}{R} At the beginning of each player's upkeep, Power Surge deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn.