This is as much as the next eight trading card games combined, including Yu-Gi-Oh!, Magic the Gathering, One Piece, and more
One of them is Mono Black Aggro
Be sure to have lots of Counter Trap cards and Quick-Play Spell cards ready to foil the foe's attempts to stop Gate Guardian's summoning
Grass type has many cards that might look weak at first glance (like Shaymin), but they all have their utility and strengths, like abilities to heal, create a draw engine, or supply quick energy
If you cast a spell "without paying its mana cost," you can't pay any alternative costs
Yanmega: OK, heres the biggie, the most versatile attacker in the game does indeed slot quite nicely into Zekrom, letting you attack for free on your off turns where you cant get a Zekrom up