Target Agrus Kos with the attack trigger and spend two, and youll be dealing damage to each opponent equal to the number of creatures you have, since theyll all get a counter and qualify as modified
Add in the fact that you get another creature whenever your opponent plays a spell on your turn, and you have the making for a pretty powerful (and fun) enchantment spell
You'll be able to play with these first at the Ikoria: Lair of Behemoths Prerelease, so talk to your store and see if you can reserve a deck
Its commander, Teval, the Balanced ScaleTeval, the Balanced Scale, manages to enable a graveyard strategy with a small ramp subtheme to help power out the Dragons that it and every other Tarkir: Dragonstorm precon wanted to include a least a few of
The main difference is that Glarb lets you manipulate the top of your library
Though he was powerful enough to resist the banishment, he was weakened from forcing his way through the barrier between realms