Saqlifice

The effect "①: The equipped monster gains 300 ATK, also it cannot be destroyed by battle" is an effect that does not start a Chain.

The effect "②: If you Tribute Summon a 'Qli' monster, the equipped monster can be treated as 2 Tributes for the Tribute Summon" is an effect that does not start a Chain Link. (You can use it as 2 Tributes not only when Tribute Summoning a "Qli" monster in face-up Attack Position or face-up Defense Position, but also when Setting it in face-down Defense Position.)

The effect "③: If this card is sent from the field to the GY: You can add 1 'Qli' monster from your Deck to your hand" is an effect that activates in the GY and creates a Chain Link. (It does not target. It can also be activated during the Damage Step.)