Defender (This creature can't attack.)

Walking Archive enters the battlefield with a +1/+1 counter on it.

At the beginning of each player's upkeep, that player draws a card for each +1/+1 counter on Walking Archive.

: Put a +1/+1 counter on Walking Archive.

Walking Ballista enters the battlefield with X +1/+1 counters on it.

: Put a +1/+1 counter on Walking Ballista.

Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.

, : Creatures of the creature type of your choice attack this turn if able.

This spell costs less to cast for each modified creature you control. (Equipment, Auras you control, and counters are modifications.)

Trample

Walking Skyscraper has hexproof as long as it's untapped. (It can't be the target of spells or abilities your opponents control.)

Defender

: Walking Wall gets +3/-1 until end of turn and can attack this turn as though it didn't have defender. Activate only once each turn.