L'héritage d'Urza

Pygmy Pyrosaur can't block. {R}: Pygmy Pyrosaur gets +1/+0 until end of turn.

Whenever Goblin Medics becomes tapped, it deals 1 damage to any target.

Whenever Treefolk Mystic blocks or becomes blocked by a creature, destroy all Auras attached to that creature.

{1}{R}{R}: Put a +1/+1 counter on Molten Hydra. {T}, Remove all +1/+1 counters from Molten Hydra: It deals damage to any target equal to the number...

Echo {2}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay ...

{T}, Sacrifice Expendable Troops: It deals 2 damage to target attacking or blocking creature.

Echo {3}{W} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay ...

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Haste At the beginning of the end step, return Viashino Cutthroat to its owner's hand.

Protection from black Cycling {2} ({2}, Discard this card: Draw a card.)

{T}, Sacrifice Ghitu Fire-Eater: It deals damage equal to its power to any target.

When Rank and File enters the battlefield, green creatures get -1/-1 until end of turn.

Flying Whenever Tethered Skirge becomes the target of a spell or ability, you lose 1 life.

Flying {B}: Regenerate Fog of Gnats.

{T}: Destroy target Aura attached to a creature.

{T}, Sacrifice Phyrexian Defiler: Target creature gets -3/-3 until end of turn.

{T}: Target creature loses your choice of flying, first strike, or trample until end of turn.

Flying Echo {2}{U} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless y...

Flying Whenever Sustainer of the Realm blocks, it gets +0/+2 until end of turn.

Echo {4} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its...

Echo {G}{G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay ...

Whenever Gang of Elk becomes blocked, it gets +2/+2 until end of turn for each creature blocking it.

You may have Lone Wolf assign its combat damage as though it weren't blocked.