The size of the second spell you cast determines how big of a spell you can steal, so you should look to cast spells that are free or reduce their mana cost, like Force of Will and Dig Through Time
And it might be that this card, despite being quite good, just doesn't beat out the other options
6/6 Illustrated by Alex Dos Diaz Standard Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
With this, you can make that happen twice
Tier 3 Archetypes This next tier of decks falls from happy to be here to I would really like to avoid this deck. They suffer from two very different problems
Notably, like Lotho, theres a strong chance this new reprint will end up selling for a good bit more than usual