Doppelwarrior takes it further, enabling plays like: Librarian + Formula = draw 2, then Synchro during your opponent's Main Arcanite, to wall up with 2400 ATK, and pop 2 cards on the crackback Black Rose, to nuke their board at the end of their Main Phase Debris + Dandy + Doppel = 2-card Trishula Formula into Librarian Librarian Formula = Draw 5 Quasar All seems well until you realize there is a lot of hate that the deck is suceptible to, ranging from pinpoint disruption or devastating floodgates
whether youre looking at the standard iteration with Water Shuriken or its ex form, Greninja stands out as one of the best cards in the game
On to the best free cards
eBay may be the most familiar to many, but its definitely not the cheapest place to find cards to flip
I actually think the +5 Deck Size is the greater cost associated with Versatile than the experience because its going to make it harder to find and draw your key assets - weapons to fight with, tools to gather clues with, etc