Most likely, Jester's Mask's user will choose a new hand of unneeded lands and/or weak spells for the opponent, which can set them very far behind
At the beginning of combat on your turn, amass Orcs 2
You need at least five basic Swamps in play before Cabal Stronghold nets you positive mana, and you can't cheese it with Urborg, Tomb of Yawgmoth quite as much, since the Stronghold only counts basics
Additionally, at a reasonable cost, Ultimecia can transform into Ultimecia, Omnipotent, a significant upgrade that grants the player a second turn
One of the best applications of sacrifice draw cards like this is being able to use them in response to removal, after all
POWER/TOUGHNESS 2/5 FLAVOR TEXT Over all his works a dark smoke hung and wrapped itself about the sides of Orthanc