Winding Constrictor (Surge Foil) [Fallout] Elf Cleric and "Whenever this creature deals

and "Whenever this creature deals combat damage to a creature

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {B} Add {B}{B}{B}

Xenagos isn't a creature

Set: The List Type: Sorcery Rarity: Mythic Cost: {3}{U}{U} Take an extra turn after this one

it can't be blocked as long as defending player controls a Forest

Winding Constrictor (Surge Foil) [Fallout] Elf Cleric and "Whenever this creature dealsSet: Fallout Type: Creature Snake Rarity: Uncommon Cost: {B}{G} If one or more counters would be put on an artifact or creature you control, that many plus one of each of those kinds of counters are put on that permanent instead. If you would get one or more counters, you get that many plus one of each of those kinds of counters instead.