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'Trample
Burrowguard Mentor's power and toughness are each equal to the number of creatures you control.
'When this creature enters or dies, put a +1/+1 counter on target creature or Vehicle you control.
'Menace
Threshold — When this creature enters, if there are seven or more cards in your graveyard, return up to one target nonland permanent to its owner's hand.
'Spells your opponents cast that target a creature or planeswalker you control cost {2} more to cast. [−2]: Create a 2/2 blue Wizard creature token. Draw a card, then discard...
'When this creature enters or dies, put a +1/+1 counter on target creature or Vehicle you control.
'{T}: Return this creature and target creature you control to their owner's hand.
'Whenever a token you control enters, put a +1/+1 counter on this creature. Whenever this creature attacks, another target attacking creature gets +X/+X until end of turn, where X is...
'Vigilance, haste
Valiant — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it.
'Whenever a token you control enters, put a +1/+1 counter on this creature. Whenever this creature attacks, another target attacking creature gets +X/+X until end of turn, where X is...
'Blue creatures you control can't be blocked.
'Black creatures you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)
As an additional cost to cast this spell, behold a Merfolk or pay {2}. (To behold a Merfolk, choose a Merfolk you control or reveal a Merfolk from your hand.)...