Convergent Star

As an additional cost to play this card, sacrifice a
non-land permanent

Whenever you gain life, gain double that life instead. Whenever a +1/+1 counter would be placed on a creature you control, put double that many +1/+1 counters on the creature instead.

If Shattered Star, Astaer and Umbrys is on the battlefield, this spell costs {1} less to cast