Niv-Mizzet Reborn (Halo Foil) [Multiverse Legends] Human Assassin Xantcha attacks each combat if

Xantcha attacks each combat if able and can't attack its owner or planeswalkers its owner controls

Not to be outdone

where X is the number of card types among other nonland permanents you control

the Immortal from your graveyard or from exile

They'll face harsh deserts

Niv-Mizzet Reborn (Halo Foil) [Multiverse Legends] Human Assassin Xantcha attacks each combat ifSet: Multiverse Legends Type: Legendary Creature Dragon Avatar Rarity: Mythic Cost: {W}{U}{B}{R}{G} Flying When Niv Mizzet Reborn enters the battlefield, reveal the top ten cards of your library. For each color pair, choose a card that's exactly those colors from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.