CURATOR COMMENTYour card idea qualifies for the Crucible, The Mormegil.
On that note, you could probably rename it to 'River of Time'; yes, I know it sounds too much like
, but if you think about the concept of 'time healing all wounds', then a river could be aesthetically inspiring based on the idea of cleansing 'water' (leading into cleansing 'time') to heal oneself. As for the art... I'm sure you can muster up the strength to find some royalty free art somewhere. ^^;
That said, in regards to people overestimating its power level - I think that this card is pretty balanced as is. All these Eternity + (insert cheap creature) x N (where N = number of times you rewind your creatures and redraw them again) combos are just too unrealistic to pull off. Can a person make a deck around (hopefully protected) Flying Eternities and this card? Probably. Would it be very efficient, even with shards? Not in my opinion. The fact that you'd have to pull such a ridiculous
4 card combo (Eternity, Flowing Time, Flying Weapon, AND Shard of Readiness) in order to take advantage of having multiple rewinds on your creatures just isn't practical. I would assume that this card would best be used in conjunction with a few Shards of Gratitude in a generic Rainbow deck or Time-stallbows in order to reap the repeatedly healing either in the beginning or mid-late game with stalling.
The best part of this card is that it heals at the BEGINNING of your turn rather at the end; too many times I've made miscalculation errors when it came down to seeing how much damage a False God would do against me; having these out and getting the healing as the turn began would give me a better perspective of what to do in order to survive another round against heavy-hitters.