Walking Ballista enters with X +1/+1 counters on it.: Put a +1/+1 counter on Walking Ballista.Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.
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 mana value X or less, put it onto the battlefield, then shuffle.
Walking Ballista enters with X +1/+1 counters on it.: Put a +1/+1 counter on Walking Ballista.Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.
Whenever Gonti's Aether Heart or another artifact you control enters, you get (two energy counters).Pay eight , Exile Gonti's Aether Heart: Take an extra turn after this one.
Destroy X target artifacts and/or creatures. For each permanent destroyed this way, its controller reveals cards from the top of their library until an artifact or creature card is revealed and exiles that card. Those players put the exiled cards onto the battlefield, then shuffle.
FlyingSacrifice Hope of Ghirapur: Until your next turn, target player who was dealt combat damage by Hope of Ghirapur this turn can't cast noncreature spells.
