Blocking a creature requires satisfying all evasion abilities simultaneously. Here you have two: flying and intimidate. Each must be independently satisfied for the block to be legal.
Flying (CR 702.9): A creature without flying or reach cannot block a creature with flying. A creature that has reach can block a flier, because reach explicitly grants that permission (CR 702.17). So reach clears the flying hurdle.
Intimidate (CR 702.13): A creature with intimidate can only be blocked by artifact creatures and/or creatures that share at least one color with it. This is a completely separate requirement. If the blocking creature is an artifact creature OR shares a color with the attacker, the intimidate hurdle is also cleared.
Both conditions must be true at the same time. So: a reach creature can block the attacker only if it is also an artifact creature or shares a color with the attacking creature. If it meets neither of those intimidate conditions, the block is illegal even though reach handles flying.
Example: Your opponent attacks with a 3/3 red-green flying, intimidate Dragon token. You have a green Spider with reach. Because the Spider is green and the attacker is also green, intimidate is satisfied; reach satisfies flying. The Spider may legally block the Dragon. If instead the Spider were mono-blue (and not an artifact), it could not block — reach solves flying but blue shares no color with red-green, failing intimidate.
Unofficial fan resource — not affiliated with or endorsed by Wizards of the Coast. Answers are AI-generated estimates grounded in the Comprehensive Rules and are not a substitute for an official judge. Verify anything match-critical.