The Shadow Monarch

Trample, Vigilance

{x}{b}: Target X Creatures in the graveyards gets Shadow counters .
{3}{b}{b}: Exile Target Creatures with Shadow counters on them, then summon Shadow tokens copies of those creatures with Shadow counters on them, but they Shadow warriors instead.
{2}{b}: Give Shadow Warriors you control, two +1/+1 counters
At the beginning of your next UpKeep, Pay {x} Amount of mana to keep X shadow warriors