The Impending cost allows you to cast the spell earlier and get its enter the battlefield effect, but it won't be able to attack until it becomes a creature when you've removed all time counters from it
And if you can't kill Orcish Bowmasters
As we can see in a larger version of the art, its actually Signal Pests claw that people have interpreted as its head, with its actual head, similar to a Xenomorphs, in the middle
Anzrag, the Quake-Mole Even a few years ago, the idea of a four mana 8/4 with upside would have been a ridiculous notion
Control decks want to play very few actual win conditions in their deckand having them be indestructible means you have to worry far less about them dying to a stray Abrade and making your ability to turn the corner and push toward winning that much harder
Monarch Initiative and monarch are very similar abilities