Once a Thopter that came under your control this turn has legally attacked, causing it to lose haste by removing Pia Nalaar won't remove that Thopter from combat
While not strictly an upgrade over Scavenging Ooze, the card is in my estimation more powerful and a bigger deal in white than green to boot
MYSTIC REMORA Undisputably the King of blue one-drops, Mystic Remora gets better the sweatier your table
Ideally, you would want to include a few other ramp spells as well, like Farseek or Rampant Growth, but Kodamas Reach is a great starting point
The 2/2 Imp tokens that Judith creates as an alternative when adding keywords might not be effective can provide excellent sacrifice fodder for any number of effects a player might want to pack into their deck lists
Malleable Impostor is an excellent Clone variant, allowing you to copy any Creature an opponent controls at Instant speed