Silent-Blade Oni

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Silent-Blade Oni deals combat damage to a player, look at that player’s hand. You may cast a spell from among those cards without paying its mana cost.

Rampaging Baloths

Trample
Landfall — Whenever a land you control enters, you may create a 4/4 green Beast creature token.

Elite Scaleguard

When Elite Scaleguard enters, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)
Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls.

Aim High

Untap target creature. It gets +2/+2 and gains reach until end of turn.

Feral Hydra

Feral Hydra enters with X +1/+1 counters on it.
: Put a +1/+1 counter on Feral Hydra. Any player may activate this ability.

Riddlekeeper

Whenever a creature attacks you or a planeswalker you control, that creature’s controller mills two cards.

Battle Rampart

Defender
: Target creature gains haste until end of turn.

Arcane Flight

Enchant creature
Enchanted creature gets +1/+1 and has flying.

Elvish Vanguard

Whenever another Elf enters, put a +1/+1 counter on Elvish Vanguard.

Ember Weaver

Reach (This creature can block creatures with flying.)
As long as you control a red permanent, Ember Weaver gets +1/+0 and has first strike.

Jalira, Master Polymorphist

, , Sacrifice another creature: Reveal cards from the top of your library until you reveal a nonlegendary creature card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.

Ambassador Oak

When Ambassador Oak enters, create a 1/1 green Elf Warrior creature token.

See Red

Enchant creature
Enchanted creature gets +2/+1 and has first strike.
At the beginning of your end step, if you didn’t attack with a creature this turn, sacrifice See Red.

Buzz Buggy

Whenever you crank Buzz Buggy, target creature gets +2/+0 and gains trample until end of turn.

Hard Hat Area

Whenever you crank Hard Hat Area, roll two six-sided dice. Hard Hat Area assembles a number of Contraptions equal to the difference between those results. (To assemble a Contraption, put the top card of your Contraption deck face up onto one of your sprockets.)

Boomflinger

Whenever you crank Boomflinger, roll two six-sided dice. Boomflinger deals damage to target player or planeswalker equal to the difference between those results.

Thud-for-Duds

Whenever you crank Thud-for-Duds, roll two six-sided dice. Thud-for-Duds deals damage to target creature equal to the difference between those results.

Gift Horse

Whenever you crank Gift Horse, roll two six-sided dice. Create a number of 1/1 red Goblin creature tokens equal to the difference between those results.