Lifegain effects fall into two categories: single-effect, big bursts of lifegain from cards like Feed the Clan, and incidental lifegain from cards like Soul Warden and Kambal, Consul of Allocation
And there you have my picks for the best cards in Tarkir: Dragonstorm
Vial Smasher deals damage equal to that spell's mana value to that player or a planeswalker that player controls
(Wizards clarifying note simply codifies the norm.) Classic wish effects (e.g., Burning Wish, Cunning Wish) fetch cards from outside the gamenormally from your sideboard in sanctioned play
Rainbow rares (sometimes referred to as Hyper Rares) sat at the top of this pile from their initial introduction in the Sun and Moon Base Set and are still popular in today's Sword and Shield sets
For most players, browsing a shops shelves means wading through countless cards that will never make the cut