Pale Rider of Trostad is also not trivial to block, even if Skulk on a three-power creature is only medium
If you copy a dork, it arrives with a +1/+1 counter so if you copy River it'll be bigger, won't die, and net you two triggers
When you cast the creature spell, you may pay the squad cost any number of times
This means if a deck is built with Ruby and Amethyst cards, it cannot contain cards from Emerald or the other ink types
One creature equipped with multiple Slayers Cleavers only requires a single Eldrazi to block it
However, the synergy of this design isn't enough to make it immune from the post-release price drop that comes for all modern Pokemon sets, sliding from $22 to its current price just above $15