Presuming a card game where there is a resource that is produced somehow, that powers all the effects a card can take.
At its core is a stack.
In order to play a creature, the following must occur:
The player must activate resources (which puts them on the stack). The stack then contains, say, 5 resources, one after the other. Then the player places a spell onto the stack, a creature. When all players choose not to put a spell onto the stack, the stack resolves. The creature resolves first, which as part of its script, pops enough resources from the stack to satisfy its resource requirements. Now, the stack is empty. The creature is placed into the zone known as "in play". The resources are destroyed as part of the creature's script.
Run python ./hooks/bootstrap.py to bootstrap your clone with the pre-commit hooks for this project.
You can find them in the hooks directory.