Create X 1/2 green Spider creature tokens with reach, where X is the number of creatures attacking you. Prevent all combat damage that would be dealt this turn by non-Spider creatures.
{2}{G}{G}
Arasta of the Endless Web
Legendary Enchantment Creature - Spider
Reach
Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach.
3 /
5
{2}
Arcane Signet
Artifact
{T}: Add one mana of any color in your commander's color identity.
{B}{G}
Assassin's Trophy
Instant
Destroy target permanent an opponent controls. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.
{2}{G}
Beast Within
Instant
Destroy target permanent. Its controller creates a 3/3 green Beast creature token.
--
Bojuka Bog
Land
Bojuka Bog enters tapped.
When Bojuka Bog enters, exile target player's graveyard.
{T}: Add {B}.
--
Cabal Coffers
Land
{2}, {T}: Add {B} for each Swamp you control.
{2}{R}
Chaos Warp
Instant
The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.
--
Command Tower
Land
{T}: Add one mana of any color in your commander's color identity.
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
{1}{G}
Nature's Lore
Sorcery
Search your library for a Forest card, put that card onto the battlefield, then shuffle.
--
Overgrown Tomb
Land - Swamp Forest
({T}: Add {B} or {G}.)
As Overgrown Tomb enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.
{1}{B}{G}
Putrefy
Instant
Destroy target artifact or creature. It can't be regenerated.
{2}{B}{G}
Skyfisher Spider
Creature - Spider
Reach
When Skyfisher Spider enters, you may sacrifice another creature. When you do, destroy target nonland permanent.
When Skyfisher Spider dies, you may gain 1 life for each creature card in your graveyard. If you do, exile Skyfisher Spider from your graveyard.
3 /
3
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swarmyard
Land
{T}: Add {C}.
{T}: Regenerate target Insect, Rat, Spider, or Squirrel. (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)
{3}{B}{R}{G}
Thantis, the Warweaver
Legendary Creature - Spider
Vigilance, reach
All creatures attack each combat if able.
Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on Thantis, the Warweaver.
5 /
5
--
Urborg, Tomb of Yawgmoth
Legendary Land
Each land is a Swamp in addition to its other land types.
--
Urza's Saga
Enchantment Land - Urza's Saga
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I -- Urza's Saga gains "{T}: Add {C}."
II -- Urza's Saga gains "{2}, {T}: Create a 0/0 colorless Construct artifact creature token with 'This creature gets +1/+1 for each artifact you control.'"
III -- Search your library for an artifact card with mana cost {0} or {1}, put it onto the battlefield, then shuffle.
--
Yavimaya, Cradle of Growth
Legendary Land
Each land is a Forest in addition to its other land types.