At the beginning of combat on your turn, another target creature you control gains haste and gets +X/+X until end of turn, where X is that creature's power
If it were on the list, itd likely be at the top, but the sorcery-speed protection and generic-goodness of the card makes it hard to definitively call it a fog
We have cards that put counters on other permanents, permanents that add counters to themselves, and some mix therein
to 8 p.m
Elvish Promenade Elvish Promenade can make your board of elves multiply faster than rabbits, especially if youve got any token doublers on board when you cast it

Animal Attendant Armored Scrapgorger Devoted Druid Drover of the Mighty Druid of the Anima Druid of the Cowl Elfhame Druid Fire Sprites Frog Butler Gemhide Sliver Golden Hind Great Forest Druid Hardbristle Bandit Harvester Druid Heart Warden Hidden Herbalists Humble Naturalist Ilysian Caryatid Intrepid Stablemaster Leaf Gilder Manaweft Sliver Naga Vitalist Nest Invader Nightshade Dryad Nomadic Elf Orochi Sustainer Overgrown Battlement Overgrown Zealot Paradise Druid Petalmane Baku Poison Dart Frog Priest of Titania Prosperous Innkeeper Quirion Elves Quirion Explorer Quirion Sentinel Reclusive Taxidermist Rootrider Faun Satyr Hedonist Scaled Nurturer Scorned Villager Servant of the Conduit Skyshroud Elf Sylvok Explorer Three Tree Rootweaver Torgal, A Fine Hound Ulvenwald Captive Undercover Skrull Urborg Elf Vine Trellis Wall of Roots Werebear Whisperer of the Wilds Wirewood Elf Woodland Weavemaster Wose Pathfinder