Riverwheel Sweep

Whenever this creature attacks, you may pay 1W. If you do, it endures 1. (Put a +1/+1 counter on it or create a 1/1 white Spirit creature token.)

Target creature gets +3/+0 and gains haste until end of turn. Harmonize 4R (You may cast this card from your graveyard for its harmonize cost. You may tap a creature you control to reduce that cost by X, where X is its power. Then exile this spell.)

Flying When this creature enters, you gain 5 life.

Mobilize 2 (Whenever this creature attacks, create two tapped and attacking 1/1 red Warrior creature tokens. Sacrifice them at the beginning of the next end step.) Your opponents can't cast spells during your turn.

T: Add one mana of any color. Activate only if you control a Dragon.

You may cast Dragon spells without paying their mana costs.

(T: Add R.)

When this artifact enters, search your library for a basic Forest, Island, or Mountain card, reveal it, put it into your hand, then shuffle. 3GUR, T, Sacrifice this artifact: Create a 5/5 green Elephant creature token. Activate only as a sorcery.