Grind the Deck, Then Strike
Brass's Tunnel-Grinder rewards calculated risk and graveyard interaction. When Brass's Tunnel-Grinder enters the battlefield you may discard any number of cards then draw that many cards plus one. That sequence lets you sculpt your hand while feeding a graveyard for future plays. In practical terms this is card selection with a built in enable for descend synergies and discard payoffs.
Play it in a deck that wants repeatable value and a quick route to transformation. At your end step if you descended that turn you put a bore counter on Brass's Tunnel-Grinder and when it reaches three bore counters it transforms into a new threat. The printed timing and counters make it easy to plan around attack steps and sacrifice lines so you can trigger the flip reliably without overcommitting mana.
Card Details:
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Mana Cost – {2}{R}
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Card Type – Legendary Artifact
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Subtypes –
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Card Text / Rules Text (Printed) – When Brass's Tunnel-Grinder enters the battlefield, discard any number of cards, then draw that many cards plus one. At the beginning of your end step, if you descended this turn, put a bore counter on Brass's Tunnel-Grinder. Then if there are three or more bore counters on it, remove those counters and transform it. (You descended if a permanent card was put into your graveyard from anywhere.)
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Power / Toughness –