mtg unicorn cards Magic The Gathering - Benevolent All creatures able to block Prized Unicorn do so. Regal Unicorn • Classic Sixth

If a player does, creatures that player controls can't attack you or planeswalkers you control until your next turn

Elsa can deny your opponent combos, protect your other characters and freeze a couple of opposing big questers for a turn to allow you to storm ahead

Artifact Inspirit, Flagship Vessel Station (Tap another creature you control: Put charge counters equal to its power on this Spacecraft

They might be stealing the cards put into graveyards with Captain N'ghathrod or taking advantage of the way it interacts with Zellix, Sanity Flayer, for example

You pay all costs and follow all normal timing rules for cards played with Unstable Amulet's last ability