One popular strategy is to use Fusion summoning with cards like: Babycerasaurus
So you can potentially see unhealthy combos like that arising again with things like Shiftry (NXD 72/99) from Next Destinies, or Vileplume from Ancient Origins, or Exeggutor (PLF 5/116) from Plasma Freeze, which are all just incredible Grass-type Pokemon that are held back by the fact that they're Stage 1 or Stage 2, which is a good way to cripple a card -- or to balance a card, I should say -- to give it a really strong ability, but you make it a Stage 1 or Stage 2, and it's slower
Thats how development began, so I hear. Elsewhere, the duo discussed the work that goes into sourcing illustrators for the many designs featured on the cards themselves
X is good by any means, so it is a great start
Etrata, Deadly Fugitive gives you access to more face-down creatures by cloaking cards from the top of your opponents decks and lets you turn them face-up more easily