For 2-black-or-green, Fiend Artisan is a 1/1 that gets +1/+1 for each creature in your graveyard, and has the power to sacrifice creatures to summon other creatures for the same converted mana cost
- 1 special leather storage box
The only other cards with a value of over $1 are: Evolution Sage - $2.09 Thassa, God of the Sea - $1.84 Alandra, Sky Dreamer - $1.76 Herald of Secret Streams - $3.93 Coma, Cosmos Serpent - $2.25 Ripples of Potential - $1.58 Wave Goodbye - $3.98 Sol Ring - $1.44 Swiftfoot Boots - $1.67 Hardened Scales - $1.70 Branching Evolution - $3.59 Karn's Bastion - $1.65 Animated Army - Bloomburrow This red-green deck is all about swinging in at your opponents with huge creatures , while the Commander, Bello, Bard of the Brambles, turns some of your enchantments and artifacts into 4/4 elementals with haste and the ability to let you draw cards if they hit your opponents
The ceiling just gets higher after that, as she is no doubt a part of a lifegain strategy
Looking over your deck you are at least 1-2 lands short and I would increase Orzhov Basilica to 4 of to give you a pseudo extra land (on average every second game when you should see it)
Obeka, Splitter of Seconds adding extra upkeep steps after the current combat phase works well alongside format staples like Phyrexian Arena, but Im interested in using it alongside the Court cards that reward you for being the monarch, especially Court of Ire and Court of Locthwain