What it does
"Allons-y!" isn't an official Magic keyword or ability—it's a French phrase meaning "Let's go!" (famously a Tenth Doctor catchphrase from Doctor Who). With the Doctor Who Commander decks now part of Magic, you might see flavorful references, but there's no rules mechanic by this name.
You may be thinking of an actual ability. A close match is "Time Lord" typal support, or mechanics like Suspend (heavily featured in the Doctor Who sets for "time counter" themes), or Doctor's companion (a partner-style rule letting a legendary Doctor pair with a legendary companion in Commander).
If you encountered "Allons-y!" on a specific card or ability, double-check the exact card text—it's likely flavor text or a custom/unofficial card rather than a recognized game term. Share the card name and I'll explain its real rules.
Iconic cards with Allons-y!
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