Outside of drawing a lot of cards pretty easily, Talion also wraps many alluring traits together for any high-mana investment: being a creature spell makes it harder to counter, being a flying 3/4 allows it to comfortably handle combat both offensively and defensively, insulating your own Ad Nauseam while pressuring your opponents, and the incidental life loss from the resolution of Talions triggered ability puts a passive clock on the game
The alliance ability doesnt nullify any ETB effects
Instead, Cayth's main attraction is the ability to pay two to proliferate
You sacrifice flying creatures but you get to do more things with your own creatures on your turn, and bouncing cards of theirs with Man-o'-War and Tradewind Rider could deal with things you don't want to give to other players but don't want the original player to have, either
#4: Entropic Uprising (24 points): Entropic Uprising the most hit-or-miss deck in the bunch
That means if you add a red mana during one step or phase, you can spend it during a later step or phase, or even a later turn