Feels a little expensive. It's downright terrible if you're forced to cast it without Encore, and by the time you're able to do that (let's say around 7 mana on turn 7) the two 2/2s won't be super impactful.

If this card is intentionally bad, I don't know if that's the best direction to head with a multicolor card that already carries a deckbuilding and drafting cost. Then again, playing multicolor cards is generally easier in a multicolor set, so I could be wrong.

That's a sensible complain. Since this is a multicolor set where the goal is to AVOID pushing toward 3+color decks, I want the multicolor cards to be significantly impactful. Luckily, it is fairly easy to move the encore ability over to Banish into the Sun.