One possibility is to cast Apocalypse, a card that gets rid of everything, including your hand, leaving you only with Barren Glory, but that needs to be done on your upkeep, so there are options like Leyline of Anticipation or Emergence Zone to give these spells flash
After it dies, you can recur it by spending some mana and exiling cards from your foe's graveyard and then flashing it out later as needed
The MTG dinosaur card Tyrant Trapjaw is rising in price
Thats just the market price, too
In that sense, Graf Reaver is your choice of a 3/3 for 1B with some downside or a clean answer to a planeswalker, with the occasional option to sacrifice a different creature and get both
Now, if I have a couple of cards from Tempest, like Furnace of Rath and Dark Ritual, Ill have to look them up