Rewind [Magic 2013]Set: Magic 2013 Type: Instant Rarity: Uncommon Cost: {2}{U}{U} Counter target spell. Untap up to four lands. "The best denials are simply that: a beginning and end unchanged, a dream with no memory."

so like the Conclave it serves

Set: Commander 2015 Type: Creature — Shapeshifter Rarity: Rare Cost: {2}{G}{G} Changeling (This card is every creature type

Set: XY: Roaring Skies Type: Colorless Rarity: Ultra Rare Retreat cost: Colorless

Set: Fate Reforged Type: Creature — Orc Warrior Rarity: Mythic Cost: {3}{B} Whenever a creature you control attacks

They never keep it for long

When Angel of Despair enters the battlefield

Set: XY: BREAKthrough Type: Fairy Rarity: Holo Rare Retreat cost: Colorless

it's rarely due to a cease-fire

Whenever a Snake you control deals combat damage to a player

Set: Expedition: Base Set Type: Colorless Rarity: Common Retreat cost: Colorless

When Cyclopean Tomb is put into a graveyard from the battlefield

and that player decides whether to flip again