Much like Sab-Sunen, Ketramose cant attack or block unless there are seven or more cards in exile split across all players
And Throne of Eldraine can even draw you extra cards
Its most commonly used with Animar, Soul of Elements, Rakdos, Lord of Riots, and other cost reduction commanders, paired with ETB payoffs like Impact Tremors
For just three mana, one of each of the Bant colors, Morska comes down quickly, potentially as early as your second turn, and at the top of each of your turns you investigate, giving you a Clue token which you can use to draw a card in exchange for two mana
There are a few MTG cards that can make players win or lose on the spot, but creating a draw is truly unique in the game
your opponents dont get a full card, and it works with Waste Not