So even if damage is doubled, the Trample math happens before that
Gandalf the White Gandalf the White is a nice addition to both Teysa Karlov and Elesh Norn, Mother of Machines decks, but I think theres a decent build of this Mithrandir as a commander of the kind of deck where you run Teshar, Ancestor's Apostle
He can show up, steal a big creature , and use it to win the game, or he can just be the last part of a mana combo that causes everyone else to lose infinite life
If you do, create a 1/1 colorless Hero creature token and put X +1/+1 counters on it
This connection is so strong that fans have theorized that Ultimecia is secretly Rinoa from the distant future, driven mad by her friends' mortality and persecution from society
Giant Adephage makes 7/7s with trample, Omnath, Locus of Rage makes 5/5s that will deal extra damage when they die, and Crested Sunmare makes 5/5s just for gaining life