This isnt much of a barrier but is still kind of annoying when other sites dont require it
However, the decks adopting its use the most (currently) are Temur Rhinos or similar Cascade-oriented decks that can levy it for an edge against matchups with Amulet Titan, Griefblade, Yawgmoth, and other top-tier decks in the format
As long as it's got a color, it's getting blocked and not hurting your dork
If a spell or ability lets an opponent cast a spell as part of its effect (such as suspend and rebound do), that opponent can't cast that spell since the resolving ability is still on the stack
the bring us Caller of the Untamed, a 2/4 Elf Shaman which can be cast for three generic and one Green mana
I know I mentioned at the start of this article that we werent interested in effects that cast opponents spells, but Im making an exception to talk about Dire Fleet Daredevil a moment because it does technically exile the spell, and because its such a cool card