Sagas were a new type of Permanent card introduced in 2018’s Dominaria that are similar to Planeswalkers in providing a series of escalating effects. They also usually provide plenty of flavour, like Phyrexian Scriptures.
Smoke ‘em if you got ‘em
In Kaldheim the sagas are all appropriately tribal or heavily-themed, and not of especial interest because we will most likely run them if our deck is in those colours or using that theme.
However, there are couple that have broader appeal and, although it’s rather begging the question, will be strong in any deck that includes those colours.
Showdown of Skalds
I — Exile the top four cards of your library. Until the end of your next turn, you may play those cards.
II, III — Whenever you cast a spell this turn, put a +1/+1 counter on target creature you control.
Boros (Red/White) leans to aggro decks, trading off early speed and aggression for a lack of staying power in the mid to late game. This is problematic for Boros in multi-Brawl where the games usually go long, so Showdown of the Skalds’ is a great card for our interests.
However, Chapter I effectively reads ‘draw four cards and play as many as you can – including Land’ and everyone wants to do that. And pretty much everyone wants to make their new creatures bigger with the Chapter II and III effect too, so this is good for any other deck with those colours too.
Binding of the Old Gods
I — Destroy target nonland permanent an opponent controls.
II — Search your library for a Forest card, put it onto the battlefield tapped, then shuffle your library.
III — Creatures you control gain deathtouch until end of turn.
Binding of the Old Gods’ Chapter I effect provides unconditional targeted removal for any non-Land Permanent, and – perhaps surprisingly in the current rotation (Kaldheim), there’s only one other card that achieves that. (Mythos of Nethroi).
So although the card doesn’t play at Instant speed, and although value from its Chapter III Deathtouch effect would require considerable contrivance, its Chapter II ramp effect is universally useful, and this card will certainly see plenty of play in decks with Green and Black