Guard Gomazoa and Wall Of Frost are good cards to stall so that you can control the game. You have enough counters to counter a possible death.

Keep using the defenders and Ponder and Sage Owl to provide you cards and time to make your game.

The creatures with flying will keep making damage plus the unblockables and  Grand Architect will give you the power you need.
After you have all set that should be enough to win the game.