While resolving Kefka, Court Mage's last ability, the next opponent in turn order chooses a permanent they control, then each other opponent in turn order does the same
The thing is, not all booster packs are the same
To fully capitalize on Infusion and similar payoffs, such as Pest Mascot, you will want to pack your deck with a steady stream of life gain effects
The most obvious home for Lukka is in Gruul Midrange, where decks are currently playing Modern all-stars like *checks notes* Glorybringer in the five-mana slot
As with all decks focused on a creature type, we want a large number of the creatures and things that support that type
Blue and green can potentially untap him several times in a single turn, and all three colors offer enough proliferate and counter-doubling to potentially ultimate a planeswalker when you first summon it (and thats without a Doubling Season)