Mind Link moves the Tamer from the battle area into the digivolution cards of one of your Digimon that has no Tamer underneath. Once linked, the pair usually unlocks the card's stronger effects, so the real decision is which Digimon deserves the Tamer and when. On [Main] timing versions you pick the moment yourself, which lets you dodge removal aimed at the standing Tamer.
16-28-1. <Mind Link> is a keyword effect that places a Tamer with this effect in the digivolution cards of a Digimon with no Tamer cards in its digivolution cards. 16-28-2. <Mind Link> effects execute processing. 16-28-3. The processing from <Mind Link> is mandatory. However, if it uses the [Main] activation timing, it can be activated and processed at a timing chosen by the player.
Comprehensive Rules §16-28 — official rules page
From Bandai's card rulings. Each links to the card it was asked about.
Can I use this card's inherited effect to gain 1 memory when I activate <Mind Link> on a digivolution card of a Digimon with this card in its digivolution cards and place a Tamer card?
Yes, you can.
Ruled Sep 6, 2024 · asked about Bibimon (BT17-003)
Can I use this card's inherited effect to digivolve when I activate <Mind Link> on a digivolution card of a Digimon with this card in its digivolution cards and place a Tamer card?
Yes, you can.
Ruled Sep 6, 2024 · asked about Bowmon (BT17-006)
11 cards carry this keyword:
Rule text © Bandai, quoted from the official Comprehensive Rules for reference. Combalo is not affiliated with Bandai.