Haste enablers are especially prominent in Goblin decks, which can easily become overwhelming with Krenko, Mob Boss or Krenko, Tin Street Kingpin at the helm
Put one of them into your hand, put one of them on the bottom of your library, and exile one of them
This doesn't just include the general dimensions - understanding the size and spacing of font, art, and borders can all help identify a legitimate card, too
Najeela, the Blade-Blossom or Urza, Lord High Artificer and deny your opponents the ability to activate their own
Expand Your Collection: Booster Packs
They don't all have white and green in their casting costs, but the and mana symbols both appear somewhere in the rules text of the cards