Brass's Tunnel-Grinder // Tecutlan, the Searing Rift (The Lost Caverns of Ixalan)

Legendary Artifact // Legendary Land Ñ Cave - Brass's Tunnel-Grinder: When Brass's Tunnel-Grinder enters, 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.) // Tecutlan, the Searing Rift: (Transforms from Brass's Tunnel-Grinder.)
{T}: Add {R}.
Whenever you cast a permanent spell using mana produced by Tecutlan, discover X, where X is that spell's mana value.