Grindstone

Vigilance When this creature enters, each player chooses an artifact, a creature, an enchantment, and a planeswalker from among the nonland permanents they control, then sacrifices the rest.

Flash When this creature enters, you may cast target instant card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.

Menace When this creature enters, you may destroy another target creature. If a creature is destroyed this way, you gain life equal to its toughness.

First strike When this creature enters, target opponent may have you draw three cards. If the player doesn't, you mill three cards, then this creature deals damage to that player equal to the total mana value of those cards.

Trample When this creature enters, distribute four +1/+1 counters among any number of target creatures you control.

At the beginning of your upkeep, you may put a charge counter on this artifact. T: You may put a creature card with mana value equal to the number of charge counters on this artifact from your hand onto the battlefield.

Equipped creature gets +2/+2. As long as equipped creature is legendary, it has hexproof. (It can't be the target of spells or abilities your opponents control.) Equip 1

Lands you control have "T: Add one mana of any color." T: Add one mana of any color.