Pros : ETB sweep plus pressure in one card
Leyline of Mutation
How to prevent a mess from forming again Once your collection is sorted, its good practice to keep it that way
Some great examples we came up with were Pia and Kiran Nalaar, Gisa and Geralf and Mina and Denn, Wildborn
But at the end of the day, it's always going to have value because this is a game about creatures attacking and blocking, and this will do so very nicely, either as a 4/4 flying haste-ed one, or just a 5/5 flying that can also shoot stuff if properly en-countered (say, by putting the counter on and not immediately swinging)
Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.) The spell with cipher is encoded on the creature as part of that spell's resolution, just after the spell's other effects