Do you mean actual control with counters, because that deck is virtually dead thanks to all the super friends decks (primarily thanks to little Teferi making counterspells useless). If you mean the Super Friends version it's actually midrange. It's probably the most well rounded deck but it does lose badly to the Green Ramp decks that play with Nissa.
And when you say Arena, are you playing Bo1 or Bo3? That also severely impacts what you should play.
Honestly that's not a good strategy. The way you want to play the game sounds like you want to play control, but control tends to sit back and kill and counter your opponent's threats until the late game where you unleash your win con. Playing high defense creatures just for defense is bad since they can get killed easily and doesn't solve the actual problem of your opponent's creatures. It's better just to play removal.
To sum it up, play a bunch of blue bounce spells and red burn spells for removal (stuff like Lightning Bolt, Lava Coil, Blink of an Eye, etc). Play counters for things that you know that will be hard to remove (ex: Counterspell, Negate, etc). Finish them off with something like Niv-Mizzet, Parun and Aetherling (which is practically guaranteed to never die once it hits to field as long as you have one land untapped since you can blink it with its own effect to dodge any removal and swing for 9 unblockable every turn).
You'd want to post this under the casual decks section. Secondly, use to card tag [(deck)] [(/deck)] around the list with no commas, without the extra parenthesis ( ).
To get to your deck, most of your cards have absolutely no synergy with each other. Pick what you prefer (aggro/midrange/control/combo) and it'll be easier to recommend what cards to use.
What are you ramping to exactly? Carnage Tyrant is the only thing costing higher than 4. Any reason why you aren't just playing the stock Mono Green Stompy list? It looks like it has the same goal, just less effective.
Tbh it looks like you jammed Mono Blue and Merfolk together, and it comes out looking worse.
You only have five sources that produce green, which isn't enough. The cards you are splashing for green isn't worth the splash (Tamiyo's great, but doesn't belong in this type of deck). Corsair also really doesn't make sense when you have strictly better cards in that slot that has flying and other abilities attached.
It doesn't help against Nexus, and I don't see how it likes to be milled when it rather sees your creatures in the graveyard and discarding. It's not the kind of card you want in a mill deck but a graveyard one.
Fixed.
This deck made Top 4 in a big tournament this weekend. It's essentially the build I've been seeing on Arena a lot.
Another one made 5th that had more vampires and less PWs.
http://www.starcitygames.com/decks/130968
Superfriends is known as Superfriends or Midrange. He's talking about the traditional control.
And when you say Arena, are you playing Bo1 or Bo3? That also severely impacts what you should play.
To sum it up, play a bunch of blue bounce spells and red burn spells for removal (stuff like Lightning Bolt, Lava Coil, Blink of an Eye, etc). Play counters for things that you know that will be hard to remove (ex: Counterspell, Negate, etc). Finish them off with something like Niv-Mizzet, Parun and Aetherling (which is practically guaranteed to never die once it hits to field as long as you have one land untapped since you can blink it with its own effect to dodge any removal and swing for 9 unblockable every turn).
To get to your deck, most of your cards have absolutely no synergy with each other. Pick what you prefer (aggro/midrange/control/combo) and it'll be easier to recommend what cards to use.
3/3s are often way less threatening compared to whatever you chose to destroy. The flexibility is also a huge plus.
You only have five sources that produce green, which isn't enough. The cards you are splashing for green isn't worth the splash (Tamiyo's great, but doesn't belong in this type of deck). Corsair also really doesn't make sense when you have strictly better cards in that slot that has flying and other abilities attached.
It doesn't help against Nexus, and I don't see how it likes to be milled when it rather sees your creatures in the graveyard and discarding. It's not the kind of card you want in a mill deck but a graveyard one.