Delina, Wild Mage | Ashnod's Altar | Lithoform Engine

(and one other card)

Declare
Delina as an attacker, triggering its ability, targeting any creature.
Holding priority, activate
Lithoform Engine's first ability by paying ({2} magic symbol) and tapping it, copying
Delina's trigger, with the copy targeting
Corridor Monitor.
Resolve the copy of
Delina's trigger, creating at least one token copy of
Corridor Monitor that is tapped and attacking.
When the
Corridor Monitor token(s) enter the battlefield, they trigger, untapping
Lithoform Engine and up to one other applicable permanent for each remaining trigger.
Activate
Ashnod's Altar by sacrificing a
Corridor Monitor token, adding ({C} magic symbol) ({C} magic symbol) .
Repeat from step 2.