Preston Garvey, Minuteman

Grand Summon — : Add one mana of any color. When you next cast a creature spell this turn, that creature enters with two additional +1/+1 counters on it.

Whenever another permanent you control is put into a graveyard from the battlefield, if it had one or more counters on it, you may put that number of +1/+1 counters on target creature.

Whenever Roxanne enters or attacks, create a tapped colorless artifact token named Meteorite with "When this token enters, it deals 2 damage to any target" and ": Add one mana of any color."

Whenever you tap an artifact token for mana, add one mana of any type that artifact token produced.

, Pay 2 life, Tap X untapped tokens you control: Add X mana in any combination of colors.

At the beginning of your end step, create a token that's a copy of target token you control. If that token is a Squirrel, instead create two tokens that are copies of it.

Enchant land

When this Aura enters, exile target nonland permanent you don't control until this Aura leaves the battlefield.

Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.

Haste

When Cloud enters, attach up to one target Equipment you control to it.

Whenever Cloud attacks, draw a card for each equipped attacking creature you control. Then if Cloud has power 7 or greater, create two Treasure tokens.

Trample, Haste

Whenever a creature you control deals combat damage to a player, exile the top card of that player's library. It perpetually becomes an artifact if it's a nonland permanent card. Until end of turn, you may play the exiled card.

, Sacrifice an artifact: Add three mana of any one color.