In my opinion, the strongest things you can do in Mono Red are: "Glass cannon" decks that either quickly pop off and win before opponents can stabilize, like Storm, Krenko, Purphoros, Slicer Crushing nonbasic lands, aka defeating a large chunk of players with a single Blood Moon The problem with these two strengths is that they aren't always the right pick for casual tables
Boromir, Warden of the Tower can be sacrificed to make all your other creatures indestructible for the turn, while also activating the rings temptation
Fell the Mighty should let us clear the board of anything bigger than Varina if we choose to target her with it
I'd messed with the Mystic a few times before this in some enchantment-heavy Death and Taxes builds and in other formats, but it's doubly good now that its second piece of text is finally relevant
SCG wants $2 and this might end up a $2 card so Im not buying in