Don't cats already have many uses? (Though often used in the same deck)
- Grow bone wall quickly
- Grow vultures
- Be useful for soul catcher and graveyard
Even with the lowered percentages (20% | 40%), stack-able is going to be a problem. Not that amazing at math, but with 3 or 4, you have a very good chance of getting an ash. Any decks with a good number of this card would be very hard to defeat, even if they are delayed by the fact that they must wait 1 turn to turn the ash into a phoenix. There aren't any mass cc cards that deal 5 damage to each creature.
EDIT: The poll has a repeat.