Having loads of fun with a mono blue deck right now
Anyone have tweaking suggestion?
*Creatures*
Siren Stormtamer x 4
Warkite marauder x 4
Spellweaver Eternal x 4
Tempest Djinn x 4
Merfolk trickster x 3
Dreamcaller Siren x 2
*Spells*
Spell pierce x 3
Wizard's retort x 4
Curious obessession x 4
Cartouche of knowledge x 3
Favorable winds x 4
*Lands*
Island x 20
Memorial to genius x 2
I don't really think Tempest Djinn is worth staying mono-blue. I've had many games where the opponent conceded immediately after I Dinsintegrated their Djinn. Blue splashing any other second color is so strong right now. Flying is good, as is Warkite Marauder, so I would keep those themes.
I would remove Spellweaver Eternal since it doesn't fly. I would also remove Siren Stormtamer, since it seems to be one of those "looks good on paper, does nothing in practice" cards. I haven't seen it do anything in games I've played.
On a structural level, your deck is aggro, not aggro control, so you should replace the counterspells.
For Warkite Marauder, I would add some direct damage like Ballista or Sorcerer's Wand to turn her ability into permanent removal.
I've thought of playing a similar deck, but u/r or u/r/w for Champion of Flame. T2 Champion of Flame + T3 Curiosity/ Cartouche is pretty nice, no? White would be for Sram.
Obviously the other u/x decks are top of the current environment. u/b (Scarab God), u/w (Teferi), u/g (Merfolk).
Some generic suggestions would be Exclusion Mage, Chart a Course, Blink of an Eye, Riddleform and Glyph Keeper. Glyph Keeper is insanely strong and underrated, I think the best blue mid-range option (and I would definitely replace Dreamcaller Siren with them). Riddleform is a great beater and your enchantments activate it.