Sylvan Sagequoia

The monster effect "When a 'Sylvan' monster is sent to the GY: You can Special Summon this card from your hand" is a Trigger Effect that activates in the hand. (It does not target. It can be activated not only when a "Sylvan" monster is sent from the field to the GY, but also when a "Sylvan" monster is sent from the hand or Deck to the GY. It cannot be activated during the Damage Step.)

Even if you have multiple copies of "Sylvan Sagequoia" in your hand, you can only activate the monster effect "You can Special Summon this card from your hand" for one of them when a "Sylvan" monster is sent to the GY.

The monster effect "Once per turn, during your Main Phase: You can excavate the top card of your Deck, and if it is a Plant-Type monster, send it to the GY. Otherwise, place it on the bottom of your Deck" is an Ignition Effect. (It does not target.)

The process of "excavate the top card of your Deck" is performed, and depending on the result, the process of "if it is a Plant-Type monster, send it to the GY" or "Otherwise, place it on the bottom of your Deck" is performed.

The monster effect "If this card is excavated from the Deck and sent to the GY by a card effect: You can target 1 'Sylvan' Spell/Trap Card in your GY; add it to your hand" is a Trigger Effect that activates in the GY. (It targets 1 "Sylvan" Spell/Trap Card in your GY. It can be activated during the Damage Step.)