Tetzimoc, Primal Death [Rivals of Ixalan Prerelease Promos]Set: Rivals of Ixalan Prerelease Promos Type: Legendary Creature Elder Dinosaur Rarity: Rare Cost: {4}{B}{B} Deathtouch {B}, Reveal Tetzimoc, Primal Death from your hand: Put a prey counter on target creature. Activate only during your turn. When Tetzimoc enters the battlefield, destroy each creature your opponents control with a prey counter on it.

and then make your wager

Set: Sword & Shield: Astral Radiance Type: Psychic Rarity: Secret Rare Retreat cost: Colorless

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

Set: Diamond & Pearl: Base Set Type: Water Rarity: Rare Retreat cost: Colorless

If you win the flip

When Oathkeeper

Set: Innistrad Type: Creature — Human Cleric Rarity: Rare Cost: {1}{B} Morbid — {T}

you may exchange control of target creature you control and target creature an opponent controls

For each opponent who searches a library this way

The first vine shows the others where to grow

Set: Neo Destiny 1st Edition Type: Fighting Rarity: Uncommon Retreat cost: Colorless

you may sacrifice Safe Haven