Creatures with power greater than the number of cards in your hand can't attack.
Bridges usually get you from one place to another. This one just gets you.
Legalities
tlrlegal
duellegal
brawlnot legal
pennynot legal
PreDH
Rulings · 1
wotc
Ensnaring Bridge's effect checks the number of cards in your hand only while a player (including you) is declaring attackers. Once a creature has legally attacked, changing its power or the number of cards in your hand won't remove it from combat.
Notes
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