booster box azurite sea TCG & CASE〔Factory Sealed〕 includes Mickey Mouse Lorcana: Azurite Sea Booster Box

White can draw cards from lifegain in various ways, but I personally shy away from Well of Lost Dreams and Dawn of Hope these days due to the heavy mana sink required to draw cards, and the inflexibility of when that mana is required

If you sac Optimus Prime, Hero Flip on your turn then when it returns to the battlefield it has summoning sickness, can't attack without haste

Bill the Pony Everyone's favorite steed 4-drop 1/4 uncommon legendary dork, Bill the Pony, arrives with two Food and then sacs one for no mana to allow one creature to deal damage equal to its toughness until the end of the turn

Flashback ensures the effect is not a one time deal, giving control and midrange decks repeatable value without overcommitting