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'Whenever Gonti's Aether Heart or another artifact you control enters, you get {E}{E} (two energy counters).
Pay eight {E}, Exile Gonti's Aether Heart: Take an extra turn after this one.
'{W}, Sacrifice this creature: Return up to one target artifact card and up to one target enchantment card from your graveyard to your hand.
'Whenever this creature attacks, return an artifact you control to its owner's hand.
'{3}{G}: Put a +1/+1 counter on this creature.
'This creature can't be blocked by artifact creatures.
'Enchant land
Enchanted land has "{T}: Add one mana of any color."
Sacrifice this Aura: Draw a card.
'Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
This creature attacks each combat if able.
'Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni.
Sacrifice another creature: Yahenni gains indestructible until end of turn.
'This land enters tapped.
{T}: Add {U} or {B}.
'{3}{G}: Put a +1/+1 counter on this creature.
'{T}: Target opponent loses 1 life. If you control a Tezzeret planeswalker, that player loses 3 life instead.