It only rarely gets life gain as a draft theme, but has done so twice ( Adventures in the Forgotten Realms and Strixhaven )
Vanillish doesn't have an Ability but it does have two moves, the first move is called Ice Beam and for two energy cards, one each of water and colorless, it does 20 damage and if you get a heads when you flip a coin the defending Pokemon is paralyzed
Graded Population Report: Charizard ex #6 Visualize the distrbution of grades in the chart
The Pikachu deck relies on outpacing the opponent thanks to cheap cards that can hit hard with few energy cards, to defeat them before they can even set up their strongest Pokemon
But in my opinion, its a step too far to lock your opponents card behind the condition that is must be cheaper than your card
Besides the fact that Canadia can be used to prevent an attack, it can also be used to stop the opposing player from activating any Monster effects and shut down Synchro Summons