The only downside is that your turn ends immediately after
The cards might read well, but they could (and in some cases do) lead to awful play patterns and unfun experiences
// Phoenix, Warden of Fire Legendary Enchantment Creature Saga Phoenix 4/4 (As this Saga enters and after your draw step, add a lore counter.) I, II Rising Flames Phoenix deals 2 damage to each opponent
It also shuffles all the negated cards back into the deck, which can remove bodies from the field and even allow you to recycle hand traps that got negated
This card might as well say, "as long as you control a creature, you cannot lose the game." 17
Explosive Getaway Explosive Getaway might not cut it for the most cutthroat of Cubes, but a 5-mana wrath that handles most small to mid-sized threats while protecting your best card seems pretty sick at the right power level, especially since you get another enters trigger out of the deal