Summon: Fenrir is an ideal ramp spell for Saga Tribal because it has similar utility to Rampant Growth (which is a top staple) at I, while its other abilities are less relevant, but also useful
These are very popular cards, particularly in higher power levels, and they were in need of reprinting
It resolves even if that spell is countered or otherwise leaves the stack without resolving
Barren Moor
As such, this is more interesting as a card that you snag a copy of for personal use, or keep on your radar as something to pick up whenever you see it underpriced for long term gains
This combination of effects means that all of your counterspells, board wipes, and nuisance cards are more efficient, and makes it all the worse because everyone else has to pay a premium to use their stuff