Verzauberung
Kumulative Versorgung -1
Begrabe am Ende Deiner Versorgungsphase alle Kreaturen, deren Gesamtspruchkosten gleich der Höhe der für die Welle des Schreckens zuletzt bezahlten kumulativen Versorgung sind.
Will not generally kill zero cost creatures because the age counters go on before the ability triggers. If would be possible if something like Power Conduit were removing counters.
If you don't pay the cumulative upkeep, you'll sacrifice Wave of Terror before your draw step begins. It won't destroy any creatures that turn.
This destroys creatures with mana value exactly equal to the appropriate number, not equal to or less than that number.