: Search your library for a legendary card, reveal that card, put it into your hand, then shuffle.

Haste

: Create a token that's a copy of target nonlegendary creature you control, except it has haste. Sacrifice it at the beginning of the next end step.

Mikaeus, the Lunarch enters the battlefield with X +1/+1 counters on it.

: Put a +1/+1 counter on Mikaeus.

, Remove a +1/+1 counter from Mikaeus: Put a +1/+1 counter on each other creature you control.

Flying

: Choose a color. Target opponent exiles the top X cards of their library. For each card of the chosen color exiled this way, create a 1/1 blue and black Faerie Rogue creature token with flying.

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Whenever a creature you control attacks alone, it gains double strike until end of turn.

Creatures you control have horsemanship. (They can't be blocked except by creatures with horsemanship.)

When you cast this spell, destroy target permanent.

Indestructible

Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.)

When Ulamog, the Infinite Gyre is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.