[1] [2] [3] Sieges are placed on your opponents side, and transform into something when you deal enough damage to it
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And we see this in some of the most popular Mono Red commander options on EDHREC: Red is very good at Burn, and three of the top Burn commanders come with built-in resiliency to removal -- Ojer Axonil, Deepest Might, Solphim, Mayhem Dominus, Purphoros, God of the Forge -- which is especially good since Red has basically no good answers to board wipes
Automated Assembly LineAutomated Assembly Line took what Whirler VirtuosoWhirler Virtuoso started and built a whole kingdom out of it
Many Control players resort to unconventional win conditions such as Laboratory Maniac or the various Jace Planeswalkers and their card drawing and milling mechanics
Compared with other removals, Unholy Heat does therefore not see as much play as Lightning Bolt or Prismatic Ending and this is the reason why I did place it just outside the Top Five personally