A possible issue with Clock Lizard.

[AndreOliveiraMendes]

I control "Clock Lizard" and have 1 "First of the Dragons" and 2 "Gem-Knight Garnet" in my Graveyard an a face-up "Yang Zing Creation". In this situation can I activate "Clock Lizard"'s effect?
I believe that I cannot, due to "Yang Zing Creation" preventing me from Special Summoning anythingfrom the Extra deck, except Synchro monsters, but it looks like that is possible in Ygopro because Clock Lizard is only checking if the card can be Fusion Summoned while it is in the Graveyard. Other possible interaction to be checked is if both Rivalry of Warlords and Zombie World are applying.
I'm supposing that, at some point, we will need a assume_location function, and maybe allowing multiple assumes of diferent type (maybe change assume to be an vector/array and change how it works to get the assumed value).