Big Play

Target creature gets +2/+2 and gains reach until end of turn. Put a +1/+1 counter on it.

Dauntless Unity

Kicker {1}{W} (You may pay an additional {1}{W} as you cast this spell.)
Creatures you control get +1/+1 until end of turn. If this spell was kicked, those creatures get +2/+1 until end of turn instead.

Ayula, Queen Among Bears

Whenever another Bear enters the battlefield under your control, choose one —
• Put two +1/+1 counters on target Bear.
• Target Bear you control fights target creature you don't control.

Kudo, King Among Bears

Other creatures have base power and toughness 2/2 and are Bears in addition to their other types.

Battlegrowth

Aggressive Urge

Target creature gets +1/+1 until end of turn.
Draw a card.

Arbor Armament

Put a +1/+1 counter on target creature. That creature gains reach until end of turn.

Battlefield Promotion

Put a +1/+1 counter on target creature. That creature gains first strike until end of turn. You gain 2 life.

Aerial Maneuver

Target creature gets +1/+1 and gains flying and first strike until end of turn.

Hydra Trainer

You may exert Hydra Trainer as it attacks. When you do, target creature gets +X/+X until end of turn, where X is the number of counters on permanents you control. (An exerted creature won't untap during your next untap step.)
{2}{G}: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.)

Faithful Watchdog

Vigilance
Faithful Watchdog enters the battlefield with three +1/+1 counters on it.

Charge

Creatures you control get +1/+1 until end of turn.

Break of Day

Creatures you control get +1/+1 until end of turn.
Fateful hour — If you have 5 or less life, those creatures gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)