Its a great card, and the only reason it isnt higher on this list is because it sort of requires that you lean into the poison effect
Once transformed it becomes a saga called The Great Work, which deals three damage to an opponent and every creature they control as it enters, then creates three treasure tokens after your next draw step, before allowing you to cast instant and sorcery spells from your graveyard the turn after that
This combination has proven useful enough to be played in multiple decks in Modern Jeskai Breach, Esper Turns, UR Murktide, Grixis Shadow, and Arclight Phoenix
As you can see, both commanders reward dealing combat damage to opponents, and they both share the Rogue creature type - which gives us a clue about where the deck is headed
This three-mana black and green sorcery allows you to return a nonland permanent to the battlefield from your graveyard with a mana value equal to up to the number of permanent cards you have in your graveyard
Kinnan's first ability is a triggered mana ability