Activate Lavaclaw Reaches's ability so that it becomes a creature.
Activate it to give it +0/+0 until end of turn infinite times to get infinite Construct triggers.
Repeat.

Infinitely large creature until end of turn

Crackdown Construct

Lavaclaw Reaches

Activate Lavaclaw Reaches's last ability by paying {1}{B}{R}, causing it to become a 2/2 Elemental creature with a new ability until end of turn.
Activate that new ability by paying {0}.
Ceaseless Searblades triggers, getting +1/+0 until end of turn.
Resolve Lavaclaw Reaches's ability, having no effect.
Repeat from step 2.

Infinitely powerful creature until end of turn

Ceaseless Searblades

Activate Lavaclaw Reaches by paying {B}{R} due to Blossoming Tortoise, causing it to become a 2/2 Elemental creature until end of turn.
Activate Lavaclaw Reaches by choosing for X to equal 1 but paying {0} due to Blossoming Tortoise, giving Lavaclaw Reaches +1/+0 until end of turn.
Repeat step 2.

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