Khenra Spellspear

Trample
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{3}{U/P}: Transform Khenra Spellspear. Activate only as a sorcery. ({U/P} can be paid with either {U} or 2 life.)

"Bolas's methods were crude and inefficient, taking generations to refine the population into a reliable source of combat units. Still, it offers us something of a head start."
—Jin-Gitaxias

Gitaxian Spellstalker

Trample, ward {2}, prowess, prowess (Each instance of prowess triggers separately.)

Khenra Spellspear // Gitaxian Spellstalker

Trample
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{3}{U/P}: Transform Khenra Spellspear. Activate only as a sorcery. ({U/P} can be paid with either {U} or 2 life.) 

 Trample, ward {2}, prowess, prowess (Each instance of prowess triggers separately.)

Khenra Spellspear // Gitaxian Spellstalker

Creature — Jackal Warrior // Creature — Phyrexian Jackal