In a nutshell (get it?) for every token you make, you will also make a squirrel token too
Then, you can cast the top card of your deck so long as its a creature spell with a mana value of two or less
Because Shifting Woodland isn't entering the battlefield when it becomes a copy of a card, any "When [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied card won't apply
It's a Standard legal set, the first Universes Beyond product to be playable in (what is ostensibly) the game's main format
Think of your own way of approaching this matchup along those two trains of thought, and you will prevail a high percentage of the time
Effectively, by paying this cost, you can ensure your attacker will deal damage to an opponent