Xenagos, God of Revels [Secret Lair Drop Series] 1st Edition whenever either of those creatures

whenever either of those creatures deals combat damage

We must understand it

Set: Alara Reborn Type: Legendary Artifact Creature — Human Wizard Rarity: Mythic Cost: {2}{W}{U}{B} At the beginning of your upkeep

Set: Limited Edition Alpha Type: Sorcery Rarity: Rare Cost: {X}{U}{U}{U} Destroy X target Mountains

and preferred to live entirely on creatures that preyed on sentient beings

Xenagos, God of Revels [Secret Lair Drop Series] 1st Edition whenever either of those creaturesSet: Secret Lair Drop Series Type: Legendary Enchantment Creature God Rarity: Mythic Cost: {3}{R}{G} Indestructible As long as your devotion to red and green is less than seven, Xenagos isn't a creature. At the beginning of combat on your turn, another target creature you control gains haste and gets +X +X until end of turn, where X is that creature's power.