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So here's the deal. Spikes are cool, and Doubling Season doubles the cool factor. Citanul Heirophants provides mana ramp (and a way to tap Gilder Bairn), and, when combined with Heartstone, allows me to tap a spike to play its ability. Akroma's Memorial and Door of Destinies are there to make sure that spikes are creatures that inspire sheer terror.
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Did you think of adding heart stone, with Citanul Hierophants out you can tap a Spike to pay for its ability
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If you want to splash blue Intruder alarm seems like a fun card to use in conjuction with breeder
You, sir, are correct. Replacing Murkfiend with Intruder and Drone with Heart Stone.
I've been playing around with spikes and conceptualizing a deck for them recently, if you still are running this deck, since you are already running doubling season and spike feeder you might think of adding channel for infinite mana. When doubling seasons are in play, when you move +1/+1 they're doubled so move a counter from any spike, get 2 (or more) on the feeder, turn those into 4 life, channel that into mana, move 2 counters on the source spike and another onto the feeder, repeat indefinitely and make all your spikes as big as you like, get as much life as you like and have fun :p
You could replace Heartstone with Training Grounds if you want to splash blue. And since you are running Doubling Seasons, Llanowar Reborn could be useful.