Activate Mirran Safehouse using Mutavault's second ability by paying {1}, causing Mirran Safehouse to become a 2/2 creature with all creature types until end of turn.
Activate Mirran Safehouse using Griffin Canyon's second ability by tapping it, untapping Mirran Safehouse and giving it +1/+1 until end of turn.
Repeat step 2.

Infinitely large Mirran Safehouse until end of turn

Mirran Safehouse

Griffin Canyon

Mutavault

Activate Mirran Safehouse using Faceless Haven's second ability by paying {S}{S}{S}, causing Mirran Safehouse to become a 4/3 creature with all creature types until end of turn.
Activate Mirran Safehouse using Griffin Canyon's second ability by tapping it, untapping Mirran Safehouse and giving it +1/+1 until end of turn.
Repeat step 2.

Combos with "Mirran Safehouse"