The other parts you need are simply a zero-cost sacrifice outlet and some effect that can place a +1/+1 counter on creatures as they enter the battlefield: Grumgully, Path of Discovery, Juniper Order Ranger, or Rhythm of the Wild for example
Is there a tax (additional mana) for the upside of being a battle
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As if that wasnt good enough, you can then special summon a Psy-Frame Driver from your hand, deck, or graveyard, giving you two monsters for free that you can use for extra deck summons
Many walls have 0 power, making up for their lack of offensive capabilities with high toughness for excellent defense
The combination of menacing artwork, franchise significance, and sheer name recognition keeps Mewtwo firmly planted among the most valuable cards in the set