It's running tons of cheap spells that make Creatures bigger, draw cards, or generate mana like Fists of Flame, Sudden Breakthrough, and Expedite
Getting plenty of play will probably have boosted its market value at least a little, but ultimately it's the low supply, inherent to any prize card, that has made Diablosis so expensive
Riot works really well with this cards first option because you could either need the +1/+1 counter to take out a large target or you can fight an opponents only blocker and then use riots haste to finish that player off
When this monster is Normal Summoned you can pay 800 Life Points: Add 1 "Zeo" monster from your graveyard, or deck to your hand
Sweet in any go-wide deck, Jacked Rabbits a solid auto-include in a rabbit themed deck, and one that I couldnt help but smile at when I first saw spoiled
Pick your favorites, put them in your deck, and battle!