Orthrus | Cerberus

[Rutarete]

With such a much lower attack, I don't think it needs +2 cost raise. +1 should be fine.

[Drake_XIV]

You forget the potential of buffs.  A simple Nightfall jumps from a +1 | +1 to a +2/3 | +1, Eclipse goes from +2 to +4/6.  Blessing hikes it from +3 to +6/9.  The high cost is meant to offset it.