wotc
"That creature" refers to the other target attacking creature. It doesn't refer to Trygon Prime, even if you didn't choose a target.
MTG · Card
◇ Catalog #143★
Trygon Prime
40k·#143★·uncommon·foil
Illus. Mathias Kollros
—
in vault
—
for trade
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wishlisted
Oct '22
3 yr ago
Value
$4.85+$1 (+18.1%)
30 days high $3.85 · low $3.26
Volatility · moderate
NM$3.85
LP—
MP—
HP
Where to buy / sell
Search links · prices vary by venue
Buy this card
Played in EDH
EDHrec rank #11,306 · Fringe play
Variants
Gameplay
Creature — Tyranid
Subterranean Assault — Whenever this creature attacks, put a +1/+1 counter on it and a +1/+1 counter on up to one other target attacking creature. That creature can't be blocked this turn.
The walls of the Necron tomb were unbreakable. The ground beneath it was not.
4/4
Legalities
tlrnot legal
duellegal
brawlnot legal
pennynot legal
PreDHnot legal
Rulings · 1
Notes
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Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Mathias Kollros
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.