Gearhulk gains life, hits creatures of any size, and has artifact synergies
Speed is often gained from playing Basic or Stage-1 attackers with low Energy costs, but Stage-2 and Control decks can be fast as well if they include basics with an attack like Ascension, use Rare Candy and/or Broken Time-Space, cheap attackers, or high counts of disruption cards in the case of Control
PLEASE NOTE THAT THIS DECK WILL BE SHIPPED OUT WITHIN 7 BUSINESS DAYS WITH TRACKING INFORMATION
They play your turn, draw your land, do nothing with it, cast your best spells at the worst possible targets, and then swing in with your Creatures against the player playing deathtouch tribal
Thallid Shell-Dweller is a classic Thallid Fungus, getting a spore counter on its upkeep and letting me make a Saproling by removing three counters