New players know what the English words Flying , Haste , Vigilance , and Intercept or Block mean, but they may not understand they're mechanically significant to the game
There are dozens and dozens of various error cards that have popped up over the years, so it may take you a while to check your collection for them, but it may be worth it if you wind up finding one
The only thing better than one mana, of course, is free
If a manarock has a way to turn itself into cards, pick it even if it's not super efficient
[C][C] Bubble Beat: 10+This attack does 20 more damage times the amount of [W] Energy attached to your Pokmon.[W][W][W][C] Roaring Seas: 120Discard an Energy from your opponents Active Pokmon.[C][C] Grand Echo-GXHeal all damage from all of your Pokmon
The more cards you can get into hand, the more likely those favorable options will be available when needed