Rapid Augmenter

The distinction between cast and not-cast is where this design does its interesting work. Two triggers fire on your other creatures entering, but they read for different things: the first hands haste to any one-power creature, no matter how it arrives; the second only rewards creatures that entered without being cast, and it pays in a stacking +1/+1 counter plus unblockability for the turn. That second clause quietly pins the card to a token-and-blink strategy rather than a normal deploy-creatures curve, because hard-casting your creatures does nothing for the evasion engine. Reanimation, blink effects, copy tokens, treasure-into-Myr, any creature that shows up by a route other than the stack: those are what turn a 1/3 into a growing, unblockable threat. It is a payoff dressed as a lord, and the two triggers are aimed at populations that only partly overlap, so the deckbuilding tension is real: cheap one-power bodies want the haste line, while free entrances want the counter line, and the cards that satisfy both are the ones worth chasing. The haste on itself is the tell that it wants to attack early and often, not sit back as a static enabler. Read the counter clause carefully before trusting it in a go-wide shell; a board full of hard-cast dorks leaves this Otter exactly where it started.