Apex Altisaur [The Lost Caverns of Ixalan Commander] Spy x Family but I believe a more

but I believe a more mundane power source might suffice

Set: Modern Horizons Tokens Type: Emblem — Wrenn Rarity: Common Instant and sorcery cards in your graveyard have retrace

Set: Tenth Edition Type: Artifact Creature — Thopter Rarity: Uncommon Cost: {0} Flying

Set: International Collectors' Edition Type: Creature — Troll Rarity: Uncommon Cost: {2}{R} {R}: Regenerate Uthden Troll

if that opponent has more life than another of your opponents

Apex Altisaur [The Lost Caverns of Ixalan Commander] Spy x Family but I believe a moreSet: The Lost Caverns of Ixalan Commander Type: Creature Dinosaur Rarity: Rare Cost: {7}{G}{G} When Apex Altisaur enters the battlefield, it fights up to one target creature you don't control. Enrage Whenever Apex Altisaur is dealt damage, it fights up to one target creature you don't control. It brings belligerence to new heights.