Germination Practicum | Deadeye Navigator | Crystalline Crawler (and one other card)

Cards

Germination Practicum in hand or in exile (exiled on a previous turn by its paradigm ability).
All permanents on the battlefield (
Dualcaster Mage is paired with
Deadeye Navigator).

({1} magic symbol) ({U} magic symbol) plus ({3} magic symbol) ({G} magic symbol) ({G} magic symbol) if
Germination Practicum is in your hand available.

If
Germination Practicum is in your hand, cast
Germination Practicum by paying ({3} magic symbol) ({G} magic symbol) ({G} magic symbol) . Otherwise, at the beginning of your precombat main phase, choose to cast a copy of it from exile without paying its mana cost.
Holding priority, activate
Dualcaster Mage by paying ({1} magic symbol) ({U} magic symbol) , blinking it.
When
Dualcaster Mage enters, it and
Deadeye Navigator's soulbond ability trigger.
Resolve the
Deadeye Navigator trigger, pairing it and
Dualcaster Mage.
Resolve the
Dualcaster Mage trigger, copying
Germination Practicum.
Resolve the copy of
Germination Practicum, putting two +1/+1 counters on each creature you control.
Holding priority, activate
Crystalline Crawler twice by removing two +1/+1 counters from it, adding ({1} magic symbol) ({U} magic symbol) .
Repeat from step 2.

This combo has been estimated to be Exhibition (Bracket 1+).