bestow mtg cards Noble Quarry Target creature gets +4/+4 and gains trample until end of turn. Born to be Compiled, Part

Having one player create a (mostly) balanced tug-of-war is a losing move likely to cause frustration and discourage usage of your mechanic

The extra token creatures work well with cards like Lich-Knights' Conquest that require you to sacrifice a creature to bring another back

Whenever you cast your second spell each turn, convert Goldbug

The card quality of a deck with as many gold spells as this one is much higher than most other decks in Pioneer, so you want to try and eliminate the risk of stumbling on mana

Given all this, I expect WotC to continue exploring doubling spells in supplemental products where Standard balance is no concern