(Faithless Looting is just a good card.) My personal favorites in this category: Baral and Kari Zev Gale, Waterdeep Prodigy Wild-Magic Sorcerer Mizzixs Mastery Creative Technique Throes of Chaos Spelltwine Mnemonic Deluge No Kill Like Overkill Sometimes things go wrong
Being able to play it as a creature board wipe in the late game when you don't need more lands is awesome, provided that you have a legendary artifact on hand to sacrifice
Of course, the more Martyr is recognized as a viable deck the more likely that is to change
I did debate on just filling the rest of the manabase with basic lands, but ultimately, I felt that restricting the nonland spells to (mostly) Golgari guild cards was already keeping the overall power level down, so adding the best lands I could to the deck was fine
So you might have Ariel Whoseit Collector on the board and use Work Together to give her the Support keyword
(Damage and effects that say "destroy" don't destroy it.) Enchantment Gift of Compleation When this enchantment enters, incubate 3