<P> As of Pro Tour 2015 in Vancouver, the Scry mechanic was introduced to the official tournament rules when taking a mulligan . After all mulligans have resolved, any player whose opening hand contains fewer cards than their starting hand size may Scry 1 . This is known colloquially as the "Vancouver Mulligan" or "Vancouver Rule". </P> <P> Creatures with trample may deal "excess" damage to the defending player if they are blocked . For example, under normal circumstances, if a 6 / 3 attacker is blocked by a 1 / 1 creature, the attacker's 6 damage is all directed at the defending creature, despite it being only able to take 1 damage before being killed . If, however, the attacker has trample, the attacking player may choose to have the difference (in this case, 5) between the attacker's power and the defenders' total toughness "trample over" and be assigned to the defending player; this choice is to be made by the attacking player, and circumstances can arise in which "overkilling" the blocking creature is a more advantageous move . Even if the blocker does not take the damage (if it is prevented, for instance) the trample damage is still assigned to the defending player . Trample only applies when a creature with trample is attacking; if a 6 / 3 creature with trample blocks a 1 / 1 attacker, the blocker's extra 5 damage cannot be assigned to the attacking player . Creatures with trample are most often green or red . </P> <P> Vigilance is a keyword of an ability that existed as far back as Limited Edition Alpha with Serra Angel, but was retroactively keyworded beginning with the Kamigawa block . Creatures with vigilance do not tap when attacking (Prior to being keyworded, these creatures' rules text read "Attacking doesn't cause this creature to tap"), meaning they can still be used during the opponent's turn to block . Most creatures with vigilance are white . </P> <P> Keyword actions are not keyword abilities, but rather specialized verbs that describe a common game action . This category of keywords was created with the release of Future Sight . </P>

What does vigilance do in magic the gathering
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