In short, they're essentially gates by another name
Tempting Fate My goal today was to try and demonstrate how much history stands behind each design we make
Protection & Clarity Why it Matters for MTG: Low-quality materials can be foggy, obscuring your card art (especially foils and mythics) and reducing visibility
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If the copied creature was copying something else, then the token enters the battlefield as whatever that creature copied, with the exceptions noted above
The first is that it gives your other Rigger creatures +1/+0 and haste, and the second is the more infamous ability of doubling up on assembling Contraptions whenever one of your Rigger creatures assembles one