It lets you place an additional card from your hand into your inkwell face down and draw one card, making it perfect for quickly stacking resources to summon heavy hitters
Thragtusk is good because it is immense value, the immediate life hit and then the 3/3 guy when Tusk goes away
Decks ramping with artifacts might want Urza, Lord High Artificer, while a deck full of mana dorks may reach for Craterhoof Behemoth
Sac, pain and shock lands, Sulphuric Vortex, Mana Crypt, Mana Vault, Phyrexian mana, Carnophage and so on and so on
Tap all creatures your opponents control
Hullbreacher Hullbreacher is another shockingly frustrating Pirate that was so powerful it was banned in Commander...and it was also a card that was printed in Commander Legends