Corrupted Zendikon — ruling 1

The enchanted permanent will be both a land and a creature and can be affected by anything that affects either a land or a creature.

Corrupted Zendikon — ruling 2

When a land becomes a creature, that doesn't count as having a creature enter. The permanent was already on the battlefield; it only changed its types. Abilities that trigger whenever a creature enters won't trigger.

Corrupted Zendikon — ruling 3

An attacking or blocking creature that stops being a creature is removed from combat. This can happen if a Zendikon enchanting an attacking or blocking creature leaves the battlefield, for example. The permanent that was removed from combat neither deals nor is dealt combat damage. Any attacking creature that the land creature was blocking remains blocked, however.

Corrupted Zendikon — ruling 4

An ability that turns a land into a creature also sets that creature's power and toughness. If the land was already a creature, this will overwrite the previous effect that set its power and toughness. Effects that modify its power or toughness, such as the effects of Disfigure or Glorious Anthem, will continue to apply, no matter when they started to take effect. The same is true for counters that change its power or toughness (such as +1/+1 counters) and effects that switch its power and toughness.

Corrupted Zendikon — ruling 5

If a Zendikon and the land it's enchanting are destroyed at the same time (due to Akroma's Vengeance, for example), the Zendikon's last ability will still trigger.

Corrupted Zendikon — ruling 6

If a Zendikon's last ability triggers, but the land card it refers to leaves the graveyard before it resolves, it will resolve but do nothing.

Corrupted Zendikon : règles, fonctionnement et interactions (MTG)

Corrupted Zendikon is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant land Enchanted land is a 3/3 black Ooze creature. It's still a land. When enchanted land dies, return that card to its owner's hand.

How it works : Corrupted Zendikon

Original English text — Wizards of the Coast / Scryfall

#1March 1, 2010· Wizards of the Coast
The enchanted permanent will be both a land and a creature and can be affected by anything that affects either a land or a creature.
No other card is named in this ruling.
#2March 1, 2010· Wizards of the Coast
When a land becomes a creature, that doesn't count as having a creature enter. The permanent was already on the battlefield; it only changed its types. Abilities that trigger whenever a creature enters won't trigger.
No other card is named in this ruling.
#3March 1, 2010· Wizards of the Coast
An attacking or blocking creature that stops being a creature is removed from combat. This can happen if a Zendikon enchanting an attacking or blocking creature leaves the battlefield, for example. The permanent that was removed from combat neither deals nor is dealt combat damage. Any attacking creature that the land creature was blocking remains blocked, however.
No other card is named in this ruling.
#4March 1, 2010· Wizards of the Coast
An ability that turns a land into a creature also sets that creature's power and toughness. If the land was already a creature, this will overwrite the previous effect that set its power and toughness. Effects that modify its power or toughness, such as the effects of Disfigure or Glorious Anthem, will continue to apply, no matter when they started to take effect. The same is true for counters that change its power or toughness (such as +1/+1 counters) and effects that switch its power and toughness.
No other card is named in this ruling.
#5March 1, 2010· Wizards of the Coast
If a Zendikon and the land it's enchanting are destroyed at the same time (due to Akroma's Vengeance, for example), the Zendikon's last ability will still trigger.
No other card is named in this ruling.
#6March 1, 2010· Wizards of the Coast
If a Zendikon's last ability triggers, but the land card it refers to leaves the graveyard before it resolves, it will resolve but do nothing.
No other card is named in this ruling.