Blinkmoth Nexus
Land
: Add 
.
: This land becomes a 1/1 Blinkmoth artifact creature with [[ keyword: "flying" ]] until end of turn. It's still a land.
: Target Blinkmoth creature gets +1/+1 until end of turn.
Sam Burley
Modern Masters 2015 (MM2)
• #236Rulings
Blinkmoth Nexus can be the target of its last ability after activating its middle ability. Activating it after it has blocked a creature won't remove it from combat or stop it from dealing and being dealt combat damage.
(wotc • 2020-08-07)
A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
(wotc • 2020-08-07)
Rulings
Blinkmoth Nexus can be the target of its last ability after activating its middle ability. Activating it after it has blocked a creature won't remove it from combat or stop it from dealing and being dealt combat damage.
(wotc • 2020-08-07)
A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
(wotc • 2020-08-07)