Wildgrowth Walker Wildgrowth Walker was a cornerstone of numerous explore strategies in the original Ixalan Standard
New booster packs of cards can be gained, new pre-built battle decks added, but all for in-game currency, earned by playing
These include leader cards, super rare characters, alternate art versions, and special promotional prints distributed during events
Bracket three dictates "no chaining extra turns", so a deck that did this would be pushed into bracket four, where hopefully it would encounter decks that have the tools to counter it
The payoff for all that seems insufficient, unless maybe you have some way of flickering Kaito himself, so you can make a Drone, then draw a card, then flicker, then draw or make another Drone
As Gamma rares go, the Sphere seems to have had a pretty good survival rate