Thundermare [Portal] Conspiracy thinking the entrance was too

thinking the entrance was too narrow for it to follow

{1}{G}{W}{U}: Put Derevi onto the battlefield from the command zone

Set: Arabian Nights Type: Creature — Fish Common Cost: {U}{U} Dandân can't attack unless defending player controls an Island

Set: Unlimited Edition Type: Artifact Uncommon Cost: {3} Basalt Monolith doesn't untap during your untap step

Set: Scourge Type: Creature — Dragon Spirit Rarity: Rare Cost: {5}{W}{W} Flying

Thundermare [Portal] Conspiracy thinking the entrance was tooSet: Portal Type: Creature Elemental Horse Rare Cost: {5}{R} Haste (This creature can attack and {T} as soon as it comes under your control.) When Thundermare enters the battlefield, tap all other creatures.