Neither creature blocks, so in order to get them into combat, you need to be attacking and making your opponent block
Comments : Once Ampharos holds a Mega Stone he/she gains great, but temporary power
2 Myrel, Shield of Argive One of the best creatures to come out of The Brothers War, Myrel, Shield of Argive comes with a unique special ability
Playtest showed Mike (and Randy, the other member of the design team) that the arcane/spirit triggers were enough
So, this is a Naturalize on a stick that can block, attack, add to your Wellwisher and Timberwatch Elf count and more, all for just one more mana than a 2/1 or Naturalize would cost
...or add some interaction