Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)
Search your library for an artifact card with converted mana cost X or less, put it onto the battlefield, then shuffle your library.

When Whirler Virtuoso enters the battlefield, you get (three energy counters).
Pay : Create a 1/1 colorless Thopter artifact creature token with flying.

, : Create a 1/1 colorless Thopter artifact creature token with flying.

When Wild Wanderer enters the battlefield, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.

Return X target cards from your graveyard to your hand. Exile Wildest Dreams.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)
Flying

If one or more counters would be put on an artifact or creature you control, that many plus one of each of those kinds of counters are put on that permanent instead.
If you would get one or more counters, you get that many plus one of each of those kinds of counters instead.

Flying
When Wispweaver Angel enters the battlefield, you may exile another target creature you control, then return that card to the battlefield under its owner's control.

When Woodweaver's Puzzleknot enters the battlefield, you gain 3 life and get (three energy counters).
, Sacrifice Woodweaver's Puzzleknot: You gain 3 life and get .

When Workshop Assistant dies, return another target artifact card from your graveyard to your hand.

All creatures get -3/-3 until end of turn.
You may cast a spell with converted mana cost 3 or less from your hand without paying its mana cost.

Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan.
Sacrifice another creature: Yahenni gains indestructible until end of turn.