Delve is used to great effect on a few cards, but more ways to cast huge spells for less while still triggering the higher cost for Rootha is an easy upgrade
Once you have Infernape evolved, you can start trying to KO your opponent straight away if the first two stages haven't been able to pick up any points
Its interesting
We had 18-month, rolling rotation, some sets being two years and others being less than a year, the end of small sets, the death and return of Core Sets, plus more Standard bannings in the last three years than anything since Urzas Saga Standard
Its respectable 140 HP pool keeps it alive through many of the games stronger attacks and 100 damage from Dragon Claw is fantastic for two Energy
If youre also dipping into artifacts whether permanents, or in token form (treasures, clues, etc) then youre double dipping on value with Vat of Rebirth