This means that it's counted by the Lord Master of Hell's ability, so it contributes extra damage when it's in the graveyard
Illustrated by: Igor Krstic
Especially given that mostly these are the weaker cheat in cards or they are ones you use in support of other themes that obviously the Progenitus wouldn't work with at all
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Unfortunately, it can't charge itself this way, but it's still a handy ability for such a low cost