The Underworld Fantasy Queen

As The Underworld Fantasy Queen enters, it becomes spring.
At the beginning of your upkeep, the next season arrives.
Spring — Whenever Her Majesty enters or attacks, you may sacrifice another creature. If you do, draw a card.
Summer — Whenever a creature an opponent controls dies, put a +1/+1 counter on Her Majesty.
Fall — Whenever another creature dies, target opponent loses 1 life and you gain 1 life.
Winter — Her Majesty can't attack or block.