This mechanic is connected to the gods of the Theros plane and was introduced in the Theros block
A two-ink card, Bucky, Squirrel Squeak Tutor has the Ward keyword, meaning that it can only be targeted by being challenged, as well as its Squeak ability, which forces all other opponents to discard a card whenever you play a Floodborn character
100% Customizable Text & Character
Ursula, Deceiver of All Finally revealed as the big bad villain of Lorcanas running story - and also given the Enchanted Rare treatment in this set as revealed here on Dicebreaker - Urusula, Deceiver of All gives a new incentive for song-focused players to peel away from the dominant amber-steel focus to try giving emerald a spin instead
Slicer, Hired Muscle It looks like people mostly play Slicer, Hired Muscle as a Voltron-style commander, never donating it and always converting it
[55] The plot and gameplay of Crystal is largely the same as in Gold and Silver , although it includes several new features