flying still blocked
When an attacker already has a defender assigned, giving the attacker flying should make it so the defender can't block any more (unless it can block flying).
I just lost a match because this is not what happened.
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[Deleted User] commented
509.1b The defending player checks each creature they control to see whether it’s affected by any
restrictions (effects that say a creature can’t block, or that it can’t block unless some condition
is met). If any restrictions are being disobeyed, the declaration of blockers is illegal.
A restriction may be created by an evasion ability (a static ability an attacking creature has
that restricts what can block it). If an attacking creature gains or loses an evasion ability after a
legal block has been declared, it doesn’t affect that block. Different evasion abilities are
cumulative.