If this is done in such a way that a loop is formed and an effect can be repeated ad infinitum, generating infinite mana, dealing infinite damage, creating infinite creatures tokens - whatever the case may be - then voila
That includes Mark of Mutiny, Act of Treason, Act of Aggression, Hijack, and any similar card that end up being printed in every other Standard set
With that being said, what funny cards have you used to tie together different engines
While I'm unaware of a list of what is in the "free/ygo points card pool" (non-premium), I am certain that any cards that are in premium packs are not in this free pool
Mastering when to spend them is one of the biggest skill jumps a new player makes
Standout cards included Dark Raichu - which at the time of the video games release wasnt even available in card form