LeaPlath Spider Sorcerer

It depends where you want this deck to go? Just generic green good stuff?

Reiver Demon doesn't boardwipe unless you cast it from hand, which seems a bit risky given the nature of the deck.

OK, so first of all, wow, not enough lands. This sort of deck wants 22-24 ideally, simply because with 10 lands you are massively reducing the number of keepable hands, as well as meaning any removal against you will be generating a ton of virtual card advantage by blanking so much of your hand that you won't be able to draw out of.

First of all, not enough lands. In this sort of deck you want 24.

Secondly, consistency is key and cards that just gain you life are bad. They need to be attached to something decent like Thragtusk.

Bond Beetle is 1 mana for a +1/+1 buff, that is pretty eh. Replace it with another infector like Ichorclaw Myr. You can cut down to 20 lands easily, even lower for more pump.

How often will you trigger Hunger of the Howlpack?

Invigorate is free powerful infect pump.

Well when the time comes, the discard goes out and in comes Force of Will. Jace, the Mind Sculptor sees play generally as a 1 of.

Like, how good do you want to make this?

Right now the issue is a lot of eh cars like a maindeck Fade into Antiquity (dead far too often), Fog (helps you not lose, doesn't help you win. etc

It is 3 mana to buff 2 creatures and just isn't impactful enough a spell. Dromoka's Command would be better. Another lord effect would be better like Metallic Mimic. An anthem effect would be better like Always Watching .

If you want to reanimate something you have a ton of options. Reanimate, Dread Return, Life/Death, Animate Dead, Shallow Grave etc

I would argue it is pretty common. Having catch all cards like that is what your sideboard is for. Your game 1 main deck should be dedocsted to csrrying out your decks plan as quickly and efficencly as possible. Then in game 2-3 you can shift your role from the beatdown to control, side out cards that dont do enough for cards like Naturalize. It is pretty basic deck building. Against the delver decks, the eldrazi decks, czech pile, etc it does nothing to help your game plan.

StP is defo better than Path. Life doesnt matter. Lands do. You trade your cards 1 for 1 and net them a bit of vortual advantage most of the time. The life is easier to deal with. There is a reason STP is played over PTE nearly 100% of the time.

Deathrite you want a full set for sure. They are 1 mana planeswalkers.

You are running 1 ton of meh 1 ofs though, or win more cards. There is a lot to be said to play playsets of the good cards, as opposed to lots of meh 1 ofs.

Gruesome Slaughter is win-more in this sort of deck. If you have a big beastie down or enough to make it good, you have already won. The same goes for Eldrazi Conscription.

Stuff like maindeck Naturalize is bad. You won't see artifacts in every deck, so in a lot of games it will just be dead. And 20 lands is no where near enough.

You shouldn't need Fog, because 1, the only point of life that matters is the last one and 2, you can play Lightning Bolt and just kill stuff.

20 lands is not enough, you ideally want about 23-24ish. Cascading Cataracts doesn't do anything because you are spending 6 mana to make 5 mana.

Why no Pride Sovereign? Makes cats who gain life and can be just huge for its cost.

My only thought is Savannah in the sideboard should be Karakas. Gets a lot of value.

Why would you ever have Probe in the sideboard as opposed to main for the information/56 card deck.

Seems pretty standard. My only suggestion is I quite like having a main decked copy or two of Split Decision somewhere to help Firemind's Foresight.

OK, so a few bits. Counterspell is better than Mana Leak and Daze is better than Deprive.

26 lands is far too many, you want maybe about 22-23.

Merrow Commerce is just eh. You untap your merfolk, you aren't doing anything else with it. Cut Harbinger as well because it doesn't do much when your merfolk as low impact like this?

This should give you about 8 more slots, max out Silvergill Adept, max out the 2 mana lords, max cursecatcher, and the deck will do a lot better.

Brainstorm before Preordain always. And fetches to help Brainstorm/Ponder.

Raging Goblin could be Legion Loyalist and be better.

Why nothing like Goblin Piledriver or Goblin Ringleader?