mtg cards that double life gain Boon Reflection | Masters put a +1/+1 counter on each creature you control Full Set of LIFEGAIN Dual

As you can see Storm, is more than just a combo finish, it can be swarming the board with tokens, casting a lot of artifacts or spells from exile to have a spectacular finish, or playing all your cards over and over to eventually close out the game

There are also cards that change power and toughness, like Brine Hag for opposing creatures or Arni Brokenbrow for your own

For example, during a Magic: The Gathering FINAL FANTASY Limited event, you can't add copies of Cid, Timeless Artificer to your deck from your personal collection

I always say lifegain decks need strong payoffs to turn their Soul Wardens and stuff into win conditions

[1]: Target player discards a card

your opponent can just recast their creature