Any ramp deck, later game deck, and control build (particularly one in W/R) will benefit from the Tower
A prehistoric plane with dinosaurs and oozes felt green, so we started there
During your upkeep you just sacrifice the card if you choose to not pay its cumulative upkeep cost
While I miss making my own sound effects when I send baby dragons into battle, and dabbing hastily at cards Ive spilled cider on in my excitement, Arena builds on the lessons learned by the rest of its genre, and takes away a lot of the friction and fuss that I will (grudgingly) admit exist in its paper incarnation
Caterpie Basic HP 50 Caterpie is a Basic grass card from Pokmon TCG Pocket
Cumulative upkeep says, "Hey, pay 1." (This assumes your abilities have the ability to speakmine do)