Gargoyle Castle is sub-optimal even in a pure token strategy
So, if any of the above playing card dimensions dont take your fancy, you can choose your own custom size to use instead
Or, combine it with mana storage effects like Electro, Assaulting Battery and save it up for another turn
If you can swing with a deadly or big creature, your opponents might be lights out
Because the triggered ability doesn't target the creature card in your graveyard, you may choose one of the two cards you put there from your library
On the cheaper end, Ravnica Allegiance rare Gutterbones is a steady frontline troop, a 1-black 2/1 that can be returned from the graveyard to your hand any time you can play a sorcery if your opponent has lost life