When it attacks, you tap a creature and add a stun counter to it, then optionally remove up to three stun counters from anywhere and draw cards equal to what you cleared
Not including Rituals as they are either completely broken or absolutely terrible
If a creature you control enters the battlefield with a hat sticker on it, Haberthrasher's triggered ability will trigger twice
The hard part is getting to that point, which is easier or harder depending on environment
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There's also Helm of the Host for a more permanent alternative, Sword of Feast and Famine to untap all your lands twice for peak combat trickery, and Sword of Wealth and Power for lots of spell copying and Treasure tokens