The Disney Lorcana Experience: Disney Lorcana is not just a game
For the most part, these sieges basically replace themselves when they enter the battlefield, either by putting a new card in the players hand or creating an extra permanent in play
My way of thinking is that Talrand, Sky Summoner always does work in a deck like this, but Impact Tremors, Witty Roastmaster, and Purphoros, God of the Forge only do work if you have another token-making creature out, and that just seems too fiddly and fragile
Theres a few other notable cards, like Recurring Nightmare and Mind Over Matter, but the value drops off steeply after that
To put it into perspective, a 1/1 deathtouch creature can handle it because The Tarrasque doesnt even have trample