Draw 1 means take the top card of your deck, no choice about it. Lines that carry draw in their inherited effects refill your hand while you evolve, which keeps the next digivolution target coming without spending extra memory. In long games remember the draws are mandatory, so decking out is a real way to lose.
16-8-1. <Draw> is a keyword effect where a player draws the cards from their deck according to the number specified in the effect. This is shown on cards using text such as <Draw 1>. 16-8-2. <Draw> effects execute processing. 16-8-3. A draw from <Draw> is mandatory.
Comprehensive Rules §16-8 — official rules page
From Bandai's card rulings. Each links to the card it was asked about.
If I have a Digimon with this Digimon in digivolution cards, and the only other card I have is a token, can I <Draw 1> with this card's <When Attacking> inherited effect?
Yes, you can. If that token is a Digimon, you can <Draw 1>.
Ruled Sep 13, 2024 · asked about Kyaromon (ST19-01)
Can I use this card's inherited effect to <Draw 1> twice if 2 of my Digimon are played from digivolution cards at the same time?
No, you can't. You can play multiple Digimon from digivolution cards, but they are played at the same time during a single timing, therefore you can only <Draw 1> once.
Ruled Sep 6, 2024 · asked about Xiaomon (BT17-002)
Does "delete 1 of your opponent's Digimon with a play cost of 4 or less instead" in this card's <When Digivolving> effect activate instead of "Trash 1 card in your hand. Then, <Draw 1>"?
No, it activates instead of "Then, <Draw 1>."
Ruled Sep 6, 2024 · asked about DexDorugamon (BT17-065)
Does "delete 1 of your opponent's Digimon with a play cost of 6 or less instead" in this card's <When Digivolving> effect activate instead of "Trash 1 card in your hand. Then, <Draw 1>."?
No, it activates instead of "Then, <Draw 1>."
Ruled Sep 6, 2024 · asked about DexDoruGreymon (BT17-067)
Can I gain <Draw 1> with this card's <On Play> effect even when this card is played from digivolution cards?
Yes, you can. When played from digivolution cards, both <Draw 1> and "gain 1 memory" can activate.
Ruled Sep 6, 2024 · asked about Xiquemon (EX6-013)
Does this card's inherited effect also activate if a single effect such as "<Draw 1>. Then, trash 1 card in the hand" trashes the same number of cards as the number that were added from the draw?
Yes, it activates.
Ruled Sep 6, 2024 · asked about Koji Minamoto (BT17-083)
If my opponent has 5 or fewer cards in their hand, which player gains <Draw 1> from this card’s <On Deletion> effect?
The player that activated this effect.
Ruled Jun 28, 2024 · asked about DemiDevimon (EX6-046)
Does this card's <Opp Turn> effect activate after an effect that adds and trashes cards in your opponent's hand so that the result is net 0 total cards gained, like "<Draw 2>. Then, trash 2 cards in your hand"?
Yes, it activates. This card's effect trashes the number of cards that were drawn. In the example given in the question, after trashing 2 cards from their hand, your opponent would trash an additional 2 cards, for a total of 4 cards trashed.
Ruled Mar 28, 2024 · asked about MadLeomon (BT10-077)
Public lines whose key cards carry this keyword, step by step.
497 cards carry this keyword; the first 30:
Rule text © Bandai, quoted from the official Comprehensive Rules for reference. Combalo is not affiliated with Bandai.