Cataclysm Hellkite

Calling (Each creature you control that shares a
creature type with this card you tap while casting this
spell pays for {1}. For each creature you tap, this
creature enters the battlefield with a +1/+1 counter on
it.)
Flying , Obstruct 4, Dreadful (This creature can
only be blocked by creatures with total power greater
than or equal to this creature's toughness.)
{b}{r}{g}{w}: Put a +1/+1 on dragon and hydra creatures you control.