Cost Reorganization

Hey guys,
I'm almost done with my Restructuring of Costs. This will allow for cards like Viscerid Drone or Urborg Panther that have more than one type of the same cost. It also streamlines the use of X as a choice (not predefined) in non-Mana costs. In my current codebase, only Sacrifice is using this format, but once the baseline gets checked in, I can go through and add it in everywhere that makes sense. The next one on my list will be for Remove Counter, since I believe that's the most common use of this Cost.
Does anyone know any existing cards that use Cost in a weird way such as Copper-Leaf Angel, Firecat Blitz, Devastating Summons, or Kaervek's Spite? (I've already tested these 4). I wanted to do some expanded testing on anything funky we have that actually uses the Cost system to make sure nothing falls through the cracks. The inputs that do the payment were hardly altered, but a good smoke test never hurt nobody.
Even if it's not as weird as the 4 I mentioned above, I'll go through any cards that people suggest, so feel free to shout out any candidates.
On a related note, after all of this is done I'm considering changing when payment of cost actually happens. So instead of Sacrificing a card immediately when I click on it, instead the Card will be recorded, removed from the possible choices, and marked on the UI somehow (some type of "Using as Payment" icon from Moomarc would be great). This will make "refunding" canceled Abilities more realistic, since currently Forge doesn't support "un-sacrificing" cards.
I'm almost done with my Restructuring of Costs. This will allow for cards like Viscerid Drone or Urborg Panther that have more than one type of the same cost. It also streamlines the use of X as a choice (not predefined) in non-Mana costs. In my current codebase, only Sacrifice is using this format, but once the baseline gets checked in, I can go through and add it in everywhere that makes sense. The next one on my list will be for Remove Counter, since I believe that's the most common use of this Cost.
Does anyone know any existing cards that use Cost in a weird way such as Copper-Leaf Angel, Firecat Blitz, Devastating Summons, or Kaervek's Spite? (I've already tested these 4). I wanted to do some expanded testing on anything funky we have that actually uses the Cost system to make sure nothing falls through the cracks. The inputs that do the payment were hardly altered, but a good smoke test never hurt nobody.
Even if it's not as weird as the 4 I mentioned above, I'll go through any cards that people suggest, so feel free to shout out any candidates.
On a related note, after all of this is done I'm considering changing when payment of cost actually happens. So instead of Sacrificing a card immediately when I click on it, instead the Card will be recorded, removed from the possible choices, and marked on the UI somehow (some type of "Using as Payment" icon from Moomarc would be great). This will make "refunding" canceled Abilities more realistic, since currently Forge doesn't support "un-sacrificing" cards.