Escape is an alternate casting cost, so all of the regular timing restrictions for the cards apply
The artifacts or creatures you untap could be used for waterbending, but my mind can't help but wander to the rocks, dorks, and cards with the best activated abilities as targets to untap
Ugin, the Spirit Dragon It took a bit for Ugin, the Spirit Dragon to see itself lead control in Standard, so I expect the same for Historic
If you cant tell from what I wrote above, Im a lot more into the Sapphire/Steel deck than I am into the Amber/Amethyst one
It's a great spell, and one of the best bounce options you'll find anywhere
Wakestone Gargoyle Another card that can wake up all your walls Wakestone Gargoyle is fine