Does becoming a copy trigger ETB?

You are correct that a clone copying a creature with an ETB like shriekmaw will trigger the ETB. Clone and its freinds go seemless from a clone spell on the stack to copy of whatever you chose to copy as it resolves and enters the battlefield so the game sees the chosen creature ETB.

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People also ask can i copy a creature spell?

Yes. You can copy them. In addition, since you are copying a spell on the stack, you can copy things that a creature-copy normally can't. Like the value chosen for X (so your Lightning Serpent token gets counters) and kicker (so your Desolation Giant token won't have to destroy itself). Is clever impersonator a creature? Clever Impersonator is not a token. In that case, Clever Impersonator enters the battlefield as a 0/0 creature, and it's put into the graveyard immediately (unless something is raising its toughness above 0).

Then, can clever impersonator copy an enchantment?

Yes. See the rulings quoted above. and finally, what about if I copy an enchantment creature that has been bestowed onto another creature? It doesn't copy the effect that makes it an Aura, so it enters in the regular Creature Enchantment form, not bestowed. In respect to this, does double strike negate deathtouch? Creatures with deathtouch deal damage during the regular combat damage step. Fortunately, if you block a creature with deathtouch with a creature with first strike or double strike, your creature will deal damage during the first strike damage step, before the deathtouch creature can return fire.

Regarding this, do planeswalkers have summoning sickness?

As a general rule, Planeswalkers do not have summoning sickness. Planeswalkers are able to activate their abilities on the same turn they are played in Magic The Gathering. Some Planeswalkers have the ability to become creatures which will make them subject to summoning sickness. What kills indestructible MTG? While Indestructible cards can't be killed by damage and ignore damage checks, their toughness outside of damage still needs to remain about zero for them to stay alive. This makes niche removal spells like Tragic Slip"especially powerful against Indestructible cards.