enough in the current metagame, due to the fact that it is an inherent -1 to use the Strikers as Tribute Fodder or as Synchro material, and there is no way to make up that advantage on their own, outside of 600 direct attacks until you reduce your opponents LP to 0 which will take a while
If heads, search your deck for a card that evolves from Mysterious Fossil and put it onto your Bench or put a card that evolves from Mysterious Fossil from your hand onto your Bench
Dragon is arguably one of the stronger Yu-Gi-Oh
Kelsien, the Plague and Kalemne, Disciple of Iroas both get +1/+1 for each of your experience counters
Reunion is best, IMO, because it can be set up for later while helping smooth your draws
It could be hard to keep around depending on whats happening in a game, but I dont think it would be too hard to do so