This Instant card has 3 mana value, which automatically triggers Yshtolas 2 damage ping to enemies and 2 life restoration for you
His ability to double all the counters you place on permanents, including +1/+1 counters, loyalty counters, poison counters, and -1/-1 counters, opens up a tonne of deckbuilding avenues, while his ability to halve your opponents counter production can stop some decks in their tracks
While yes, it does play a little slower than an in-person game of Magic , and there is an extra layer of communication needed to make things work, it mostly plays about as well as normal Magic
If you have enough Rat tokens on the battlefield and a board wipe happens, it's possible that Mirkwood Bats can burn all of your opponents out of the game