Kyle Winkler (he/him) is a teacher and fiction writer
As for the ones we think are most worthy of your time, expert Magic play Abigail Shannon has the lowdown in her write-up on the best MTG Final Fantasy Commander decks
It's a good attacker or blocker, and it creates more creatures for you over time
For me personally, Id probably be in GW mostly on the back of good summons, rares, and Rinoa Heartilly
I'd argue it's either being mana flooded (if you've ever been the player at the table who is empty-handed and top decks lands for a couple turns in a row, you'll know what I mean) or mana screwed (see: basically every Commander Clash game from Crim's perspective)
Grim Flayer discourages your opponents from attacking and not leaving back blockers, unlike Sylvan Advocate