While this one does present the risk of languishing in your hand for some time, you still get three modes that can get you out of trouble, because countering instants will often mean protecting a key creature on your side of the board from a removal spell
Sapphire With five Villains and ten Heroes, Sapphire also has a great deal of choice with its characters
We've seen some Planeswalkers so far, but this crew includes some creatures cutified through Bloomburrow's unique magic
This is the best 1 mana answer to answer Urzas Saga permanently as it causes Urzas Saga to loses all ability and get the sacrifice
In some cases, it can even be more powerful than the Moxes
I say this as someone who hasn't really touched the IP much, if at all, so that speaks volumes