Protection: Look for Auras that grant Indestructible , Ward , or Totem Armor
"Roll Call" Designs These cards specifically call out their colors (or associated basic land types) in their text box
Peeking at the top of your library and casting Merfolk from there is a nice effect, and tacking on to create a 1/1 Merfolk is a tasty boon
It costs 7, and also equips for 7 but gives +7/+7 to the creature barring it, who when it attacks can destroy target creature an opponent controls
Winds of Rath Winds of Rath needs a specific deck to work, but its often a powerful one-sided board wipe in decks that can meet the condition
-5: You get an emblem that says "Whenever you cast a creature spell with infect, target player gets a poison counter." The reason I like these is because the +1 is like Carrion Call , the -2 is a Corpse Cur effect, and the -5 is an emblem of Hand of the Praetors