Deep Delvers

Dive/Tunnel: Each round, Deep Delvers can Dive/Tunnel or Surface (not both) as an Instant. When below the surface, flip the card over; they cannot interact with anything on the surface. When they Attack the same round they Surface, Deep Delvers have Stealth.
Eyes of Madness: when a creature attempts to Block Deep Delvers, it must either take -1/-1, or roll a die. On 1-2, they Block. On 3-4 they do nothing. On 5-6, they Attack themselves.