The first version of Explorer's Bane seems like it's in the right spot I'm not a fan of 1/turn things and (as you pointed out) exploring on discard is self-fueling
To put it simply, every time you open a pack theres a chance that one (or more) of the cards will be a wildcard
Special Summon 1 "ZW -" or "ZS -" monster from your hand, then, if you control a "Utopia" monster, you can make all monsters you currently control become all Level 4 or all Level 5
In addition to buffing up your arboreal attack force, Verdeloth also offers you the option of a side-line in Saprolings, which can provide a welcome bit of board presence in what is usually a go-tall strategy
Omega has both, TCG rules and OCG rules programmed in it for the respective format
And these were just a few of the possibilities theres also Hammer Time, Scales, Broodscale combo and more