Itll be an interesting case to follow
I count: 37 lands and Canoptek Wraith, Illuminor Szeras, Sol Ring, Wayfarer's Bauble, Arcane Signet, Mind Stone, Thought Vessel, Commander's Sphere, Unstable Obelisk, Hedron Archive, Sceptre of Eternal Glory, Gilded Lotus, Caged Sun 50 mana
While there may be better options depending on the specific strategy of the deck, Martyr's Cause can be a valuable inclusion in decks looking to protect their board presence or gain incremental advantage through sacrificing creatures
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Gnottvold Slumbermound Land This land enters tapped
And then there is the internal competition among a card's different versions -- foils, reprints, borderless, showcase, and promos