It appears as though Green has never had a Sorcery/activated ability that gives this to your whole team. So here's that! Top Swap makes it so you can use it repeatedly to give your team evasion. You can keep playing it turn after turn, as long as you have the board to meaningfully swing.

Without the Kicker, and considering the filtering done by Top Swap, how does this feel? Would you be happy playing this effect for 3? Should the threshold for "can't block" be higher?

The kicker might be too "please only play this spell every turn", eh? It's here to help turn the card in to even more of a finisher, but slowly. Mostly I'm just enjoying putting Kicker on these to make the cards feel more relevant later.