Valgavoths Onslaught A lot of the Green decks I play will frequently get to 12+ lands in play
Second Ability: Grand Strategist - At the beginning of combat on your turn, another target artifact creature you control gets +2/+2 and gains menace until the end of the turn
Its rarity and status as a big, splashy dragon make it a collector favorite
18 Winter, Misanthropic Guide Group Hug At Its Finest A lot of group hug cards are typically enchantments or artifacts, but with Winter, Misanthropic Guide, you get a very strong draw effect for the whole table right in the Command Zone
Third, see if you can find lands that cover more than one of your colors (especially if they can enter untapped)
Deny the Witch This four-cast instant costs three colors of mana but is very strong with the ability to counter any spell or activity and then force that person to lose some life