Baris, Collector of Stars

Artifact Landwalk, Vigilance
{w/u}{w/u}: Choose a card name. Activate this
ability only once each turn.
Whenever a player casts a spell with the
chosen name, you may create a Sky Diamond token and draw a card.
Astral Strike — {x}{w/u}{w/u}{w/u}{w/u}: Target
unblocked creature gets +X/+0 until
end of turn.