Goblin Storm had 23, however, if you include basic lands and tokens, so we could get a lot more than that if Wizards is feeling generous
Additionally, in Standard, the most popular multi-color control deck makes better use of tri-color Lands with basic Land types, such as Sparas Headquarters
Skullclamp works best in decks that make expendable X/1 creature tokens of all types, which certainly includes most Goblin tribal decks
Creature - Vampire Color tag templates(None) Vengeful Pharaoh Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) Whenever combat damage is dealt to you or a planeswalker you control, if this card is in your graveyard, destroy target attacking creature, then put this card on top of your library
Each card has the potential to last for decades, growing in value as it becomes scarcer on the secondhand market
Ive seen this deck pop off and level entire boards by bringing Massacre Wurm back to slay a bunch of tokens, and there are some low-cost creatures to get the ball rolling pretty quickly