3BR, T: Put two target creature cards from graveyards onto the battlefield combined into one creature under your control.
There are two number words there. Increasing or decreasing the first is apparent enough in what it would do (I would rule that if you combine one creature, it's still combined) but how do you combine two creature cards into two creatures? Or five, if you have enough copies of More or Less? Which one(s) are represented by the physical card(s)?
(I expect the answer is "we don't know yet" but I'd be curious to know if there ends up being an actual ruling on this.)
Due to the nature of More or Less and Grusilda, I don't expect the new interactions between those two cards, including the "combining" mechanic in Grusilda, to be covered to any extent in the comprehensive rules, let alone rigorously. Unlike with bona fide Magic cards, thisThe interaction between Grusilda and More or Less, as with other situations unique to Unstable cards, is a gap that is rather deliberately meant to be filled in by the players in a particular game — usually in the spirit of having fun.
EDIT (Jan. 16): Correctness edit in view of changes to the Magic Tournament Rules with Rivals of Ixalan.
There are two number words there. Increasing or decreasing the first is apparent enough in what it would do (I would rule that if you combine one creature, it's still combined) but how do you combine two creature cards into two creatures? Or five, if you have enough copies of More or Less? Which one(s) are represented by the physical card(s)?
(I expect the answer is "we don't know yet" but I'd be curious to know if there ends up being an actual ruling on this.)
Due to the nature of More or Less and Grusilda, I don't expect the new interactions between those two cards, including the "combining" mechanic in Grusilda, to be covered to any extent in the comprehensive rules, let alone rigorously. Unlike with bona fide Magic cards, thisThe interaction between Grusilda and More or Less, as with other situations unique to Unstable cards, is a gap that is rather deliberately meant to be filled in by the players in a particular game — usually in the spirit of having fun.EDIT (Jan. 16): Correctness edit in view of changes to the Magic Tournament Rules with Rivals of Ixalan.