When Wild Wurm enters the battlefield, flip a coin. If you lose the flip, return Wild Wurm to its owner’s hand.

Echo {4}{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 its echo cost.)

Whenever Witherscale Wurm blocks or becomes blocked by a creature, that creature gains wither until end of turn. (It deals damage to creatures in the form of -1/-1 counters.)

Whenever Witherscale Wurm deals damage to an opponent, remove all -1/-1 counters from it.

Trample

When Worldspine Wurm dies, create three 5/5 green Wurm creature tokens with trample.

When Worldspine Wurm is put into a graveyard from anywhere, shuffle it into its owner’s library.

Deathtouch, lifelink

When Wurmcoil Engine dies, create a 3/3 colorless Phyrexian Wurm artifact creature token with deathtouch and a 3/3 colorless Phyrexian Wurm artifact creature token with lifelink.

Trample (This creature can deal excess combat damage to the player or planeswalker it’s attacking.)