Creature swarms still work, but these decks tend to run Anger of the Gods
Also can we please appreciate this absolutely beautiful list over at Forbes
Aetherize is another option for this kind of effect, though returning creatures to hand is much less impactful
For some really tricky plays, you can also target your own creatures, either in response to a kill spell or just for some added creatures to bolster your Elves with some extra tokens
Core mechanics include ramp, dinosaur tribal synergies, and combat-focused strategies that capitalize on the decks powerful creatures
It's an excellent source of card advantage in your manabase if you're playing at most one, maybe two colors, and it can fill in gaps for colors that don't have unmitigated access to card draw