Plaza of Heroes (252p) [Dominaria United Promos] Deckmasters there is an additional combat

there is an additional combat phase

Set: Antiquities Type: Enchantment Rarity: uncommon Cost: {G}{G} Whenever an artifact an opponent controls becomes tapped or an opponent activates an artifact's ability without {T} in its activation cost

you may pay {0} rather than pay the mana cost for a colorless spell you cast from your hand

Set: Eventide Type: Enchantment Rarity: rare Cost: {2}{W}{W} Chroma — Each creature you control gets +1/+1 for each white mana symbol in its mana cost

or vigilance on it

Plaza of Heroes (252p) [Dominaria United Promos] Deckmasters there is an additional combatSet: Dominaria United Promos Type: Land Rarity: rare {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a legendary spell. {T}: Add one mana of any color among legendary permanents you control. {3}, {T}, Exile this land: Target legendary creature gains hexproof and indestructible until end of turn.