Thundermare [Portal] Urza's Destiny Promos At the beginning of the

At the beginning of the upkeep of enchanted enchantment's controller

Shield of Emeria enters the battlefield

each defending player chooses any number of creatures they control and divides them into a number of piles equal to the number of attacking creatures for whom that player is the defending player

{T}: Add {U} or {B}

It blocks each attacking creature this turn if able

Thundermare [Portal] Urza's Destiny Promos At the beginning of theSet: 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.