Nashi, Moon Sage's Scion - [Etched Foil, Showcase] Kamigawa: Neon Dynasty (NEO)Ninjutsu {3}{B} ({3}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever Nashi, Moon Sage's Scion deals combat damage to a player, exile the top card of each player's library. Until end of turn, you may play one of those cards. If you cast a spell this way, pay life equal to its mana value rather than paying its mana cost.

Choose any number of target players or planeswalkers

you would need to assign the ocarina to an item slot

Walking Ballista enters the battlefield with X +1/+1 counters on it

{3}{G}: Target creature gets +2/+2 until end of turn

put three +1/+1 counters on it and it becomes monstrous

Pharika isn't a creature

haste Whenever Aurelia

trample Whenever O-Kagachi Made Manifest attacks

{T}: Choose any number of target creatures

put four +1/+1 counters on it and it becomes monstrous

search your library for any number of Dwarf cards

sacrifice it unless you pay its echo cost