It was so good it was quickly banned, and remains to this day illegal in Modern and Legacy
Similarly, its second ability triggers even if the creature spell with mutate was cast for a cost other than its mutate cost
Commander Deck includes 1 deck of 100 Magic cards (98 nonfoil cards and 2 Traditional Foil Borderless Legendary cards), 10 Archenemy cards, a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil alt-border card of rarity Rare or higher and 1 Traditional Foil Uncommon card), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card
With Ivy, you generally build it as a very different Voltron-style deck, casting a bunch of enchantments and single-target spells and turning them into two-for-ones by making sure you target someone other than Ivy
A non-foil or traditional foil source material card appears in every Collector Booster