A creature with the God race will always feature the God Link keyword. Gods can also be easily identified due to the card frame "spilling" out of the usual border towards the side where the God can be linked. Linking the other specified God will usually result in both Gods forming one larger picture with the "spill-over" artwork.
Most Gods can link through either their left or right side, while others can link through both sides, forming an eventual 1x3 formation. In later cases starting with DM-27 Perfect Heaven, combinations of Gods can link on all 3 sides (top or bottom, left and right) in such a way that they form a 2x2 formation or even a 2x3 by DM-35 Neverending Saga.
When you put this creature into the battle zone, search your deck. You may choose up to 2 God creatures from it and put one into your hand. Then shuffle your deck, and put the other chosen God creature on top of your deck.
When you put this creature into the battle zone, you may discard a card from your hand. If you do, search your deck. You may take a God from it, show it to your opponent, then put it into your hand. Then shuffle your deck.
When you put this creature into the battle zone, choose one of your opponent's creatures in the battle zone. If you have a God in your mana zone, that creature gets -4000 power this turn. If you don't have a God in your mana zone, that creature gets -2000 power this turn.
When you put this creature into the battle zone, search your deck. You may choose and take 1 God from it and show it to your opponent. Then shuffle your deck and put the chosen God on top of your deck.
Count the number of your Gods in the battle zone. For each of your Gods, add the top card of your deck to your shields face down. Then, look at all of your shields. You may put any number of Gods from among them into the battle zone.
Put the top 5 cards of your deck into your graveyard. If there is a God among these cards that is able to link with a God in the battle zone, put that God into the battle zone and link it with that God.
The crossed creature gets "Power attacker +3000" and can attack untapped God creatures. Whenever the crossed creature battles a God creature, it gets +12000 power. Whenever the crossed creature attacks a God creature for the first time in a turn, untap the crossed creature.
When you summon a God, and one of yours Gods is available for linking is in the battle zone, you can choose to immediately invoke the God Link. Otherwise, you cannot link the Gods except through an effect. Similar to evolution creatures, linked Gods do not get summoning sickness, even when all the Gods to be linked are played in the same turn. Some abilities listed on Gods trigger only when the God Link is invoked, while others continue to be active while the Gods stay linked.
Once linked, the Gods are considered one creature, with their costs, names, races, power, civilizations and abilities all combined. This also means that when Gods of different civilizations are linked, the resulting creature is multicolored. When a linked God attacks, all parts tap as one, and when a linked God would leave the battle zone, you can choose which piece leaves this way. When you evolve a linked God, all parts of the creature count as one base creature, and when the top card of this pile is removed all Gods are linked again. Unless one part of a god has double breaker or better, the linked god creature only destroys one shield.