MCXVI skc's Ramp Istanu

This deck is used in MCXVI to mainly against pure ramp BG.
Whale, Istanu, Fugu with campfire can kill opponent's whale.
Iona's smile can serach whales or Istanu, the finishers.
I want to beat red deck with the sac "MCXVI skc's Against Red Sac", but thinking when I can't do so, this deck is strong to red with defensive colossus.
I think whale deck is likely to be beaten by souleaters, but changing whales to Istanu can reduce the situation.
This deck can't use feed for the other deck but I need mana boost, so touching yellow works well using soul pact.

Defensive playing with this deck is also strong to Y tempo because of tosser (in fact, this deck usually won Y tempo in the ladder), but I lost by Luuu's brilliant chargers.