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They can still be used in the deck like a normal card

The problem is that a 2/2 (even a 2/2 with flying) can be outclassed fairly quickly, so delaying Vexing Gull trades its early game relevance (pecking in for damage) for mid-game value (when you might be behind in the race or not be able to attack with Vexing Gull)

If Devourer of Destiny is countered or otherwise leaves the stack in response to that triggered ability, the triggered ability will still resolve as normal

They're an absolute blast to shuffle and can be effectively used for any situation constructed decks, Cube, Commander, you name it

Ratadrabik might have benefited the most from the Ring tempts you mechanic