That often puts a stop to ramp strategies or +1/+1 counter strategies, and it invalidates casting expensive spells
While we'll have to wait to see whether this new format is picked up by existing players, it definitely has the potential to bring new fans to the game
These cards are playable in Tarkir: Dragonstorm Draft and Sealed when opened from Play Boosters
It will trigger each upkeep, like Tendershoot Dryad, and give you some serious lifegain as the game goes on
Besides the creatures that have already been mentioned in the article, here are some more considerations for your Mutate masterpiece
Tapping a creature when he attacks is good, and getting bigger with each artifact you play can be nice, but with no evasion and no protection he's likely to just get removed before you have a chance to do anything