You can only use each of the following effects of "Borrelcode Dragon" once per turn
When a new set comes out or an expansion is released, some older cards become illegal in official tournaments because they no longer fall within the bounds of what's considered acceptable by official developers
Or, alternatively, theyre beautiful cards that got left behind due to being included in unpopular sets
If a creature has a single -1/-1 counter and you proliferate, its going to permanently have two -1/-1 counters, and so on
Also included are play mats one for each player with a really useful, visual guide as to where everything is placed, along with a rules summary to help players out over the course of the game
You have plenty of those already and they are far less unreliable