Something like a Grislebrand can allow you to get up to 12 mana for Blightsteel Colossus, which you have a 1 in 3 chance of getting, since there are only three 12-drops
Simply put, the combination of these four abilities will force folks to deal with your Sorin early, or not at all
Ive leaned toward Kraul Harpooner and Price of Fame, despite the fact that theyre pretty narrow, because removal spells that put creatures in your graveyard a lot better than those that dont, though maybe Im fixating a little too much on Charnel Troll
While not obscure, some partner combinations I haven't seen
7 //// Invocation of the Founders Enchantment Whenever you cast an instant or sorcery spell from your hand, you may copy that spell
To the best of my recollection (with a dash of dramatic license), here's how Defiant Elf's inclusion in Legions played out: Them: We have a hole for a small green card