What it does
Reach lets a creature block creatures with flying, even though it doesn't have flying itself. That's the entire ability—it's purely defensive and does nothing on offense or in any other situation.
The most common misunderstanding is thinking reach grants flying or some kind of evasion. It doesn't. A creature with reach attacks like a normal ground creature and can still be blocked by anything. Reach also doesn't let you block multiple attackers or interact with abilities that say "as long as you control a creature with flying"—it only addresses the blocking restriction that flyers impose.
In Commander, reach matters because flying is one of the format's dominant evasion strategies, especially with dragons, angels, and Voltron flyers. A few well-placed reach creatures (or a board-wide grant like Spidersilk Armor) can quietly neutralize an opponent's entire aerial offense.













