All Sylvans have 1 effect that allows you to excavate cards and send any Plant-Type monster excavated to the grave, while the rest (if any) go to the bottom of your deck
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your opponent sends 1 card of that type from their Deck to the GY
An article explaning their deckbuilding choices for their winning decklist
The only way they can beat you is by preying on a clunky opening and Life doesnt work when your opponents monsters rarely hit the graveyard
For Link Monsters, like Salamangreat Heatleo , you normally cant just replace one copy of the monster with another, but the Salamangreat Sanctuary Field Spell makes it possible