(It's an artifact with " , , Sacrifice this token: You gain 3 life.") , Sacrifice this enchantment: Target opponent loses X life, where X is the amount of life you gained this turn
On card advantage specifically
+3/+0 doesnt help most creatures to survive combat, but its quite strong on evasive creatures, so the strength of this card is quite variable
Krenko, Mob Boss If goblins or red aggression are your thing, Krenko, Mob Boss is a fine choice
Will people still open product if they cant crack more than $50 worth of singles
Stormanother "mistake" mechanicwas continually targeted by bannings even after the deck was essentially unplayable, and the only reason that makes sense is that Wizards simply wants to wipe the memory of the mechanic out of existence