Barrowgoyf Aetherdrift create a token that's a

create a token that's a copy of it

where X is the number of Swamps you control

Cheer — Whenever one or more creatures you control with counters on them deal combat damage to a player

Sacrifice X Squirrels: Target creature gets +X/-X until end of turn

this creature deals 1 damage to them

Barrowgoyf Aetherdrift create a token that's aDeathtouch, lifelink Barrowgoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1. Whenever this creature deals combat damage to a player, you may mill that many cards. If you do, you may put a creature card from among them into your hand.