People draw enough cards these days that they should never always be dead to Farewell
Like most Pokmon cards, the value of Eiscue depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Paldea Evolved)
As expected, cards with a higher grade will cost more
Assuming an infinite deck size for simplicity sake and exactly a 50% targets to non-targets ratio then you have about 11% chance to wiff your company, of which about 1.5% (1/64) are your odds on getting the double wiff
For two mana you get to give a creature +1/+1, menace, and trample as long as it is enchanted with the aura
This blue instant gives you the first chance to rebuild, but you can also engineer situations where your opponents attack each other before you send them back to square one