For those of you unfamiliar with this infamous combo, once you give Walking Ballista Lifelink with Heliod's activated ability, you can remove a +1/+1 counter to ping something, gain life from the damage, then Heliod immediately replaces the +1/+1 counter since you've gained life
typically, theres 12 Leader cards per booster box of 24 packs
If an effect would cause you to exchange life totals with another player, the exchange won't happen
There's also Ringsight, a card that effectively allows you to search your library for any card, provided you have a creature in play that shares a colour with it
The idea was for this to be the sequel to Magic: The Gathering , but plans changed along the way and almost every single new product under the MTG banner would be backwards-compatible, with them changing how they release each batch of cards
Since it takes all graveyards into account you will avoid graveyard hate stopping your game-plan