Arcbound Mamba [Unknown Event] UPR043/UPR042 The boots demonstrated many strange

The boots demonstrated many strange magical properties

Set: Invasion Type: Enchantment Rarity: Rare Cost: {3}{U} Domain — Creatures can't attack you unless their controller pays {X} for each creature they control that's attacking you

" —Great Threshold of Monserkat inscription

Then if there are four or more charge counters on it

Arcbound Mamba [Unknown Event] UPR043/UPR042 The boots demonstrated many strangeSet: Unknown Event Type: Artifact Creature Snake Rarity: Common Cost: {3}{G} Deathtouch Poison Modular 2 (This creature enters the battlefield with two +1 +1 counters on it. When it dies, you may put its +1 +1 counters on target players or artifact creature. If they're put on a player this way, they become poison counters.)