Urza, Prince of Kroog | Mycosynth Lattice | Training Grounds

(and one other card)

Activate
Urza by paying ({4} magic symbol) , creating a token copy of
Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate
Urza by paying ({2} magic symbol) , creating a token copy of
Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate
Urza by paying ({1} magic symbol) , creating a token copy of
Crumbling Vestige that is a 1/1 Soldier in addition to its other types.
When the
Crumbling Vestige token enters the battlefield, it triggers, adding ({1} magic symbol) .
Repeat from step 3.