Its watermark looks like a combination key and umbrella
The goal was to self-bounce and recast your things to trigger ETB things (Mulldrifter), self-bounce things (Azorius Aethermage), leaves play things (Circuit Mender), cast things (Equilibrium) and tapping the dork for something valuable (Opposition), with a bounce of self-bounce (Erratic Portal) and a flicker backup theme (Far Traveler proper) in order to lean into the non-cast stuff
And nobody is happy about it
Planeswalker cards and abundant indestructible permanents help its case, but the truth is, it was always good
For years, Wrath of God played that role, but as more noncreature permanents got involved, the control answers had to evolve
Six Six is the tree from Wrenn and Six on its own