They're not a requirement for a good deck, but mythic rares can be the bombs and strategy-accelerating cards you need
Defined Control Planeswalkers Jace's flexibility exemplifies how blue planeswalkers leverage loyalty for control
in multiplayer games with a longer-term build-up, it was no longer easy to build on the destruction of lands, rather on the sacrifice mechanics and their passive damage output, as well as the destruction of the opponents creatures
I went with Phyrexians, but you could go heavier into artifacts, +1/+1 counters, or even planeswalkers
What do Magic card rarities mean
But should it remain on the battlefield, Fearless Liberator becomes an immediate threat in KHM Limited matches that can spiral out of hand if not dealt with