Ajani, Adversary of Tyrants [Core Set 2019 Prerelease Promos] Mercadian Masques negate the Summon OR activation

negate the Summon OR activation

Set: Eternal Masters Type: Artifact Rarity: Uncommon Cost: {3} Sacrifice a creature: Add {C}{C}

Numsgil did in Blog

that player simultaneously sacrifices the artifact and returns the artifact card to the battlefield

Set: Sun & Moon: Forbidden Light Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Ajani, Adversary of Tyrants [Core Set 2019 Prerelease Promos] Mercadian Masques negate the Summon OR activationSet: Core Set 2019 Prerelease Promos Type: Legendary Planeswalker Ajani Rarity: Mythic Cost: {2}{W}{W} +1: Put a +1 +1 counter on each of up to two target creatures. 2: Return target creature card with converted mana cost 2 or less from your graveyard to the battlefield. 7: You get an emblem with "At the beginning of your end step, create three 1 1 white Cat creature tokens with lifelink."