A creature is summoned sick unless you’ve controlled it continuously since the beginning of your last turn. In this case, you must wait until your next turn begins to tap the creature.
Summoning sickness is an informal term for the rule that a creature cannot attack or use activated abilities with either the tap ( ) or untap ( ) symbol if it has not been continuously controlled by a player since the beginning of the player’s last was turning.
A creature loses the summoning disease when it takes an untap step. A discarded creature returns to the battlefield at the start of your untap phase. In fact, at the start of your turn, creatures “lose” “Summoning Sickness” (note that this is a slang term, not a rules term).
Yes, you can block with a creature affected by the summoning disease. This is the full rule on “Summoning Sickness”; I’ve highlighted the relevant parts in your case: 302.6.
Does haste nullify the summoning disease? Haste negates summoning sickness. Older cards — from before Season 6, when MTG designers made haste a keyword — say, “This creature is unaffected by the summoning disease.” They are exactly the same.
Although all permanents are affected by the summoning disease, only creatures, artifact creatures, land creatures, planeswalker creatures, and enchantment creatures (or lands, artifacts, planeswalkers, or enchantments that have become creatures) are affected by the summoning disease.
Conversely, summoning disease does not affect a creature’s status. Summoning Sick doesn’t change whether a creature is tapped or untapped, or face up or face down.
Summoning sick creatures can crew vehicles, just as they can tap to activate other abilities like convoke. So if you play a creature with enough power each turn, you can still crew your vehicle and attack with impunity.
From the revised rulebook: “Once an artifact becomes tapped, you may not use it again until it is untap, even if it isn’t normally tapped. Even the artifact’s continuous effects will stop until it is untaped unused.”
Yes, A creature with immortal return would have the summoning disease.
The only thing that prevents the summoning disease is using the creature’s own tap ability or attacking. You may target a currently summoned creature with spells and abilities. You may also enchant it, sacrifice it, attach equipment to it, and block with it.
So Summoning Sickness is an effect when land enters the battlefield. A land that becomes a creature can be affected by the “Summoning Sickness”. You can’t attack with it or use any of its tap abilities (including its mana abilities) unless it started your last turn on the battlefield under your control.
It would have a summoning disease, but that doesn’t stop it from being able to block. Summoning Sickness is all about being able to use abilities with the (un)tap symbol and declaring yourself as an attacker. So yes, you can block with it.
Generally Planeswalkers don’t have Summoning Disease. Planeswalkers can activate their abilities on the same turn they are played in Magic The Gathering. Some planeswalkers have the ability to become creatures that expose them to the summoning disease.
You can use a tap ability with instant speed, so as long as the cost is paid and the creature has NO summoning disease, you can use the ability whenever you have priority.
MTG Rush Rules
What do the MTG rules say about Rush? This creature can attack and tap once it comes under your control. Magic: The Gathering Comprehensive Rules 702.10 and 302.6. Essentially, if a creature has haste, you can attack with it on the turn it enters the battlefield.
No sun ring is used equally, however. Sometimes it is played by a cEDH player to win within the first rounds. Other times, it’s being played by someone in their tribal Cephalid deck. Regardless, a Sol Ring in turn 1 means the game is about to start, and fast.
Vehicles cannot attack the turn they come under your control unless they have haste. However, creatures that just came under your control can be tapped to activate the crew ability. And there are more pilots in this set that have abilities that pair particularly well with vehicles.
Creatures sick with summoning can crew vehicles because they can tap to activate abilities (e.g. convoke). However, vehicles are affected by the summoning sickness, but you can crew a vehicle to block, but you can’t attack it the turn it comes into play unless it comes with haste.
Note, however, that the summoning disease rule is very specific. It doesn’t prevent a creature from using another ability that doesn’t have a tap or untap symbol (e.g. Smoke Spit), and it doesn’t prevent you from tapping that creature to pay the cost of another spell or spell other ability to pay .