The former requires a Divine-Beast monster to be discarded as a cost, while the latter must be banished from the Graveyard while a Divine-Beast is in the Graveyard
K'rrik will also be a target the second he hits the board, so be sure to run protection or reanimation like Beacon of Unrest to keep him on the board.
Depending on how well you looked after your cards in the 90s and noughties, you could be sitting on a goldmine
But its ability to gain life whenever a land enters the graveyard is okay at best, and in a vacuum and without a way to reliably find Argoth, Titania might struggle to do much in a game
Compared to Magic: The Gathering, Yu-Gi-Oh has been light on officially supported formats, with fans instead homegrowing their own communities to play legacy formats
There are plenty of empty deck slots that you can use for custom decks, and with over 9000 total cards to unlock and use, there's a lot of room to experiment with here