AI DraftApr 12, 2026
Gravecrawler + Grimgrin, Corpse-Born + Rooftop Storm
AI draft — not yet human-reviewed. Check citations and flag anything that looks wrong. How pages are reviewed.
Overview
With Grimgrin, Rooftop Storm, and Gravecrawler under your control you may cast Gravecrawler from your graveyard (Gravecrawler's own permission) and Rooftop Storm makes its mana cost 
so you can cast it for free; after it resolves you may sacrifice that Gravecrawler to Grimgrin's sacrifice ability to untap Grimgrin and put a +1/+1 counter on it, then cast Gravecrawler from the graveyard again — repeating this loop produces arbitrarily many +1/+1 counters as long as you can cast Gravecrawler from the graveyard each time (you must control a Zombie when you begin casting) [2011-01-22] [2011-09-22].
so you can cast it for free; after it resolves you may sacrifice that Gravecrawler to Grimgrin's sacrifice ability to untap Grimgrin and put a +1/+1 counter on it, then cast Gravecrawler from the graveyard again — repeating this loop produces arbitrarily many +1/+1 counters as long as you can cast Gravecrawler from the graveyard each time (you must control a Zombie when you begin casting) [2011-01-22] [2011-09-22].Step 1
Ensure the board state: Grimgrin and Rooftop Storm are on the battlefield under your control, and at least one Gravecrawler card is in your graveyard; Grimgrin is a Zombie so it satisfies Gravecrawler's "you may cast this card from your graveyard as long as you control a Zombie" condition .
Step 2
Start the loop by casting Gravecrawler from your graveyard. Rooftop Storm lets you pay instead of Gravecrawler's mana cost, so you may choose that alternative cost when casting; casting places the spell on the stack and follows normal timing/priority rules .
instead of Gravecrawler's mana cost, so you may choose that alternative cost when casting; casting places the spell on the stack and follows normal timing/priority rules .Step 3
Once Gravecrawler is on the stack, if you somehow lose control of the Zombie that allowed you to begin casting, the cast still continues and the spell will resolve normally — the requirement was checked as you began casting [2011-01-22].
Step 4
Allow the Gravecrawler spell to resolve; it enters the battlefield. (If it is sacrificed or otherwise moved before resolving, normal rules about spells on the stack and moving cards apply .)
Step 5
Activate Grimgrin's ability: "Sacrifice another creature: Untap Grimgrin and put a +1/+1 counter on it." Sacrifice the Gravecrawler you just cast. That sacrifice puts Gravecrawler into your graveyard , the activated ability goes on the stack, and when it resolves Grimgrin is untapped and gets a +1/+1 counter.
Step 6
With Gravecrawler back in your graveyard and Grimgrin still a Zombie you control, you may repeat: cast Gravecrawler from your graveyard for (Rooftop Storm) and sacrifice it again to Grimgrin, accumulating more +1/+1 counters. Repeat as long as you have priority and the necessary game resources.
(Rooftop Storm) and sacrifice it again to Grimgrin, accumulating more +1/+1 counters. Repeat as long as you have priority and the necessary game resources.Step 7
Note that Rooftop Storm replaces only the mana cost; any mandatory additional costs would still need to be paid when casting [2011-09-22].
Resolution
If you control Grimgrin and Rooftop Storm, you can repeatedly: cast Gravecrawler from your graveyard for (Rooftop Storm), let it enter the battlefield, sacrifice it to Grimgrin's "Sacrifice another creature" ability to untap Grimgrin and put a +1/+1 on it, then cast Gravecrawler again from the graveyard — producing as many +1/+1 counters as you like so long as the casting-condition (controlling a Zombie at the time you begin casting) is satisfied each time. Once a Gravecrawler spell is on the stack, losing control of that Zombie doesn't undo that cast [2011-01-22]; Rooftop Storm only replaces the mana cost, so any mandatory additional costs would still need to be paid [2011-09-22] .
(Rooftop Storm), let it enter the battlefield, sacrifice it to Grimgrin's "Sacrifice another creature" ability to untap Grimgrin and put a +1/+1 on it, then cast Gravecrawler again from the graveyard — producing as many +1/+1 counters as you like so long as the casting-condition (controlling a Zombie at the time you begin casting) is satisfied each time. Once a Gravecrawler spell is on the stack, losing control of that Zombie doesn't undo that cast [2011-01-22]; Rooftop Storm only replaces the mana cost, so any mandatory additional costs would still need to be paid [2011-09-22] .Feedback