Most people run three or even two of certain legendary cards in their decks for this reason
The thing is, losing life is easier than gaining (and much more dangerous)
Like, say, what GingerGiant shared: My favorite white and green token generators are: I love Fresh Meat, as it provides a fantastic way to protect your board by converting all of your (ideally) weak tokens into big, nasty tokens
Armored Ascension, Strata Scythe and Blackblade Reforged should each pump Reidane up to be at least a three-turn clock
Plus, these cards feature paws-itively wag-nificent new art by Allison Carl, Alayna Danner, Jakob Eirich, Nicole Gustafsson, Fiona Hsieh, Jack Hughes, Nana Qi, and Andrea Radeck
I wouldn't want to run this maindeck in a green or white creature heavy deck as there is every chance this fails to grow to a sensible size in time to be relevant