It is a little lower power than the Angel but they are sufficiently close that I am perfectly happy with either if I need some top end meat
The bonus of sacrificing Treasures to mass-pump all your creatures with two +1/+1 counters is strong, and this Mardu commander combines well with white cards and black cards with +1/+1 counter synergies
Four mana for a 2/4 reach Deathtouch is already pretty decent, but then it also has a way to fix your mana on top
Anyone whos had the misfortune of playing against Prosper, Tome-Bound will know that Rakdos players can absolutely run away with the game if allowed to rack up too much Treasure, and Decadent Dragon is the perfect enabler for most red/black Treasure strategies
The fact you can cycle this away if you dont need it is just the icing on the cake
Im including Sylvan Library here, but if you ask resident cEDH expert Drake Sasser, youd get a decidedly less optimistic opinion about this green enchantment