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Featured Rulings & Columns
Commonly confused rulings, explained topic by topic. Tap any title to read the full column.
[When Digivolving] vs. [On Play]: What's the Difference?
Which one triggers? Two effect timings players often mix up
"Battle" Effects and <Piercing>
Does a security check happen in a battle without an attack?
"When Trashed" Effects Vanish If You Use the Trashed Card
Triggering and activating are separate steps — pending activation and new cards
Understanding "Digivolve Ignoring Digivolution Requirements"
What gets ignored — and what never does
What You Can and Can't Do to a Digimon That "Isn't Affected by Effects"
Where immunity works — and where it doesn't
"When This Digimon Would Leave" Effects and Simultaneous Triggers, Done Right
Why <Evade> and "doesn't leave" effects can activate again and again
Why Multiple "Attack at End of Turn" Digimon Still Only Get One Attack
<Vortex>, Marcus Damon & Agumon, and inherited Tyrannomon — the processing rules
Arts Digivolve, Explained
When you can Arts Digivolve — and how the simultaneous triggers resolve
Dual Cards: Is That Effect a "Digimon Effect" or an "Option Effect"?
Link effects, after Arts Digivolve, and effect-activated cases
When Do [On Play] / [When Digivolving] Effects Activate — and When Don't They?
Prohibitions, suppression, the breeding area, and optional conditions
"When This Digimon Wins a Battle" and Simultaneous Triggers, Done Right
Battle-win effects vs. [On Deletion] effects — who resolves first?
"Next End of Turn" vs. "End of Turn": How Many Times Does It Try to Delete?
With "next," once only; without it, every single time
Must You Process an [All Turns] Effect in Full? Mandatory vs. Optional
"After that" often splits an effect into a forced half and a free half
"By Doing X" and "Also": Does the Effect Chain or Not?
Skip the "by" condition and everything after dies; "also" stands alone
The Security Trio, Untangled: Checks, [Security] Effects, {Security} Effects
Three confusable security mechanics, split apart by the official rules
When Does "When You Use an Option Card" Actually Trigger?
"Use" vs. "activate by effect"; "the card's cost" vs. "the cost you pay"
Digivolution Cost Reduction: Can Multiple Copies Stack?
"Digivolving" effects vs. cost-reduction effects
"New Cards" and Areas: The Moment an Effect Evaporates
The same physical card becomes a different card when it changes areas
Anatomy of "By Doing X, ... May Digivolve ... With the Cost Reduced by X"
The "digivolving effect" shared by Deputymon, Asuna Shiroki, and BlackGatomon
Revealed Cards, Checked Cards, Face-Up Cards: How Each Is Treated
"Reveal," "look at," and "face up" sorted out by the official rules
Digimon Effect or Tamer Effect? The Truth About "Treated as a Digimon"
When an information-adding effect makes a Tamer count as a Digimon, whose effect is it?
"When Trashed From Security" Effects — and Playing Straight Out of Security
Direct trashes vs. trashes after a reveal