Bringing any permanent back from the graveyard is already strong, but adding both hexproof and indestructible counters turns that permanent into a long-term problem for your opponents
Astarion, the Decadent Card seems like a fun addition to a black-themed control deck in Magic: the Gathering, providing card advantage and potentially disrupting opponents' strategies
If you head over to the Card Image Gallery and peruse some of the other aftermath offerings, there are a lot of devastating effects that a little bit of self-mill can set up for you
As, in the next turn, The Argent Etchings gives your board +1/+1 and Double Strike
While Garth may not have cast all these spells in Arena, I feel confident that he could have, had he needed to (or if his library had been shuffled differently?)
This is why it's essential to have things to do when you're out of cards but have lots of mana